Chapter Summaries

Key Plot Points and Events

• Vegeta is fully absorbed by Majin Buu, eliminating the possibility of the Super Saiyan God's appearance in this timeline.
• Baros decides to infiltrate Universe 6 to create a Super Saiyan God and use it to awaken his bloodline.
• Baros begins refining Majin Buu's consciousness and soul using the Dragon Elephant Prison-Suppressing Scripture.
• Majin Buu's terrifying abilities, including Black Magic and White Magic, are highlighted.
• Baros successfully refines Majin Buu's body and begins creating a clone using the Nine-Turn Profound Technique's One Qi Transforms into Three Pure Ones method.

Character Developments

• Baros: Shows his cunning and ruthlessness in his plan to awaken his bloodline and gains the ability to create clones.
• Majin Buu: Despite his immense power and abilities, he is completely refined and erased by Baros.

Significant Themes

• Power and Ambition: Baros' desire for power drives him to infiltrate another universe and refine a powerful being.
• Immortality and Invincibility: Majin Buu's immortality and invincibility are explored, only to be overcome by Baros' refinement.

Character Interactions

• Baros and Majin Buu: Baros refines and erases Majin Buu, showing the power dynamic between them.
• Baros and Universe 6: Baros' plan to infiltrate Universe 6 hints at potential interactions with its inhabitants, such as Champa and Vados.

Key Plot Points & Events

• Baros injects a drop of his essence blood into Majin Buu's core, enabling a trace of his soul power to grow within Buu.
• After three days, Majin Buu awakens and is controlled by Baros.
• Baros orders Buu to expel Gohan, causing Buu's strength to drop significantly.
• Baros provides Buu with Gogeta's energy, restoring and enhancing his strength.

Character Developments

• Majin Buu (Kid Buu clone) awakens and exhibits a personality distinct from Baros, showing curiosity and concern about his strength.
• Baros demonstrates his understanding of Majin Buu's limitations and weaknesses, showing wisdom in managing his clone's power.

Significant Themes

• Power and its consequences: Baros manipulates Buu's power, understanding its benefits and drawbacks.
• Control and autonomy: Buu exhibits a separate personality from Baros, hinting at potential autonomy.

Character Interactions

• Baros and Majin Buu (Kid Buu clone) interact, with Baros showing a dominant, guiding role while Buu expresses concerns about his strength.
• Baros and Gohan's interaction is implied through Buu's actions, showing Baros's disregard for Gohan's well-being.

Summary of "Dragon Ball: Martial Glory Shakes Heaven and Earth"

Key Plot Points and Events

• Baros refines Majin Buu into a clone, enhancing his absorption ability to directly transform absorbed power into strength, without the original's weakness.
• The Kid Buu clone absorbs Gogeta's energy to boost his power, preparing for a trip to Universe 6.
• The Kid Buu clone dismisses Universe 6's threats, considering only God of Destruction Champa and Vados as worthy opponents, and Hit as negligible.

Character Developments

• Majin Buu's clone, now a Kid Buu clone, gains enhanced absorption abilities and access to Baros's powers, making him a formidable force.
• Baros, through refining, strengthens the Kid Buu clone, demonstrating his own growth and power.

Significant Themes

• Power and strength: The Kid Buu clone's growing power and his disregard for Universe 6's threats emphasize the theme of strength and its perception.
• Absorption and transformation: The enhanced absorption ability and its transformation into pure power highlight the theme of change and growth.

Character Interactions

• Baros and the Kid Buu clone: Their interaction shows Baros's mentoring and empowerment of the clone, fostering a sense of trust and dependence.
• The Kid Buu clone and Universe 6: The clone's dismissive attitude towards Universe 6's threats, except for Champa and Vados, shows his growing confidence and arrogance.

Key Plot Points and Events

• Kid Buu refines an energy source given by Baros, significantly boosting his battle power to over 900 billion.
• Kid Buu's power is so immense that it causes the void to crack.
• Baros, satisfied with Kid Buu's progress, acknowledges his strength but also warns him about the vast gap between mortal and godly power.
• Baros reveals that he knows of even more powerful beings beyond Gods of Destruction, such as Angels and supreme experts from other realms.

Character Developments

• Kid Buu: Shows rapid growth in power after refining the energy source, demonstrating his potential and excitement with his newfound strength.
• Baros: Exhibits wisdom and understanding of the universe's power dynamics, acknowledging Kid Buu's progress while keeping him grounded about the vast differences in power levels.

Significant Themes

• Power and Growth: The chapter emphasizes the continuous growth and increase in power, with Kid Buu's transformation serving as a prime example.
• The Gap Between Mortals and Gods: Baros highlights the immense difference between mortal power and divine power, foreshadowing the challenges ahead for Kid Buu and other characters.

Character Interactions

• Baros and Kid Buu: Baros acts as a mentor figure, guiding Kid Buu and helping him understand the true extent of his power and the challenges ahead. Their interaction shows a mix of pride in Kid Buu's progress and caution about the future.

Key Plot Points and Events

• Kid Buu's clone expresses excitement and agitation upon hearing about powerful figures, but Baros's caution makes him reconsider.
• Baros reveals the strength of Gods of Destruction, particularly Beerus, who has grown significantly stronger after seclusion.
• It's mentioned that the Dragon Ball Macrocosm originally had 18 Universes, now reduced to 12.
• Baros hints at the potential of Kid Buu's clone, suggesting he could reach the level of Whis or higher given time.

Character Developments

• Kid Buu's clone: Initially excited and arrogant, he becomes cautious and humbled after learning about the strength of other characters. He regains confidence after Baros's praise of his potential.
• Baros: Shows a more serious and contemplative side, providing insight into the power dynamics of the Dragon Ball Macrocosm.

Significant Themes

• The theme of power and growth: Characters are defined by their strength, and growth is a result of time, effort, and potential.
• The theme of potential: Kid Buu's clone is praised for his untapped potential, suggesting that one's true strength may not be immediately apparent.

Character Interactions

• Baros and Kid Buu's clone: Baros acts as a mentor figure, providing guidance and praise to Kid Buu's clone, helping him understand the true extent of his potential and the challenges ahead.

Key Plot Points and Events

• Baros discovers a world within the Primordial Dao Imbuement where one can cultivate the soul or martial arts to attain the Dao.
• He teleports Kid Buu to this world using the Primordial Dao Imbuement's power.
• In this world, a powerful cultivator named Hong Yi, the Martial Sage or Yang God, senses Kid Buu's arrival.

Character Developments

• Baros: Shows his ability to traverse dimensions and find worlds suitable for cultivation.
• Kid Buu: Teleported to a new world without understanding or consent.
• Hong Yi: Senses a powerful threat (Kid Buu) and is concerned about his world's safety.

Significant Themes

• The power of cultivation and the pursuit of the Dao.
• The vastness of the multiverse and the existence of different worlds with varying strengths.
• The potential threat posed by powerful beings to smaller worlds.

Character Interactions

• Baros and Kid Buu: Baros explains their situation to Kid Buu, who is initially confused but marvels at Baros's methods.
• Hong Yi and Kid Buu: Hong Yi senses Kid Buu's presence but has not yet interacted with him.

Key Plot Points & Events

• Baros, a powerful being from the Journey to the West World, discovers the Yang God World's strength through his Kid Buu clone, finding it surprisingly powerful with experts exceeding 100 million combat power.
• Baros sends his Kid Buu clone to find Hong Yi, the Yang God World's strongest expert, believing Hong Yi possesses the I Ching, a cultivation method that can deduce anything, including the locations of the remaining Profound Apertures.
• Hong Yi senses Kid Buu's approach and prepares to face him, realizing the impending threat to his world.

Character Developments

• Baros: Shows shock at the Yang God World's strength and sends Kid Buu to retrieve the I Ching, demonstrating his cunning and ambition.
• Hong Yi: Acknowledges the threat posed by Kid Buu and prepares to face him, displaying his seriousness and responsibility as the world's ruler.

Significant Themes

• Power dynamics: The disparity in power between Baros and Hong Yi highlights the theme of power dynamics and the consequences of unequal strength.
• Ambition vs. Responsibility: Baros's ambition for the I Ching contrasts with Hong Yi's responsibility to protect his world.

Character Interactions

• Baros and Kid Buu: Baros sends Kid Buu to retrieve the I Ching, showing their master-servant relationship and Kid Buu's obedience despite his disdain for Hong Yi's power level.
• Hong Yi and Kid Buu: Hong Yi senses Kid Buu's approach, setting up their impending confrontation and showcasing Hong Yi's awareness of the threat.

Key Plot Points and Events

• Kid Buu, a powerful foe with battle power exceeding 900 billion, arrives at the Yang God Great World.
• Kid Buu receives a cautionary message from his original body, Baros, about the world's potential complexities.
• Kid Buu disregards the warning and confronts Hong Yi, the world's ruler, seeking the I Ching artifact.
• Kid Buu's overwhelming presence and power terrify the local experts, who hope Hong Yi can suppress him.

Character Developments

• Kid Buu: Exhibits arrogance, impatience, and disregard for opponents weaker than him. Shows initial compliance with Baros's instructions but dismisses them later.
• Hong Yi: Maintains composure and caution when facing Kid Buu. Reveals a hidden power and presence upon learning Kid Buu's purpose.

Significant Themes

• Power dynamics and disparity: Kid Buu's immense power contrasts with the locals' weakness, highlighting the theme of power imbalance.
• Caution vs. Arrogance: Baros's caution is juxtaposed with Kid Buu's arrogant dismissal of potential threats.
• The unknown: Both Kid Buu and the locals are uncertain about the true nature of the Yang God World and the I Ching's significance.

Character Interactions

• Kid Buu and Hong Yi: Their interaction is tense and confrontational, with Kid Buu demanding the I Ching and Hong Yi initially maintaining a respectful facade before revealing his hidden power.
• Kid Buu and Baros: Though not physically present, Baros's influence is evident in Kid Buu's initial caution and eventual disregard for his instructions.
• Kid Buu and the local experts: The experts view Kid Buu as a terrifying threat, hoping Hong Yi can subdue him, while Kid Buu dismisses them as insignificant.

Key Plot Points and Events

• Kid Buu and Hong Yi (Yang God) meet, with Kid Buu demanding the I Ching.
• Hong Yi refuses, leading to a battle between the two.
• Hong Yi attacks with the Vacuum Great Hand Seal, sending Kid Buu flying.
• Kid Buu, enraged, unleashes his full power, shrouding the world in evil aura.

Character Developments

• Kid Buu: Initially calm, he becomes enraged when injured, displaying his destructive nature despite Baros' influence.
• Hong Yi: Proud and arrogant, he refuses to back down despite facing an overwhelming opponent, showing his determination and strength.

Significant Themes

• Pride and Arrogance: Both Kid Buu and Hong Yi exhibit these traits, leading to their conflict.
• Power Dynamics: The clash between the two highlights the power struggle between different realms and entities.

Character Interactions

• Kid Buu and Hong Yi: Their interaction is marked by hostility and disrespect, leading to a fierce battle.
• Kid Buu and Baros (off-screen): Baros' influence on Kid Buu is evident, as he initially shows restraint but becomes enraged when injured.

Key Plot Points and Events

• Hong Yi, unaware of Kid Buu's self-reassembly ability, attempts to destroy his physical body but fails.
• Kid Buu, enraged, attacks Hong Yi with a powerful kick, severely injuring him.
• Hong Yi retaliates with his signature technique, "Heaven-Earth Wind-Thunder Four Swords," but Kid Buu easily deflects it.
• Kid Buu unleashes a purple energy blast, annihilating Hong Yi's sword energy and creating a void.
• Hong Yi is further beaten by Kid Buu, who shows no signs of stopping.

Character Developments

• Hong Yi: Struggles against Kid Buu's immense power, initially confident but becomes powerless and shocked by Kid Buu's strength.
• Kid Buu: Displayed immense power, casually defeating Hong Yi, and revealing his intention to keep Hong Yi alive.

Significant Themes

• Power Imbalance: The vast difference in power between Hong Yi and Kid Buu is emphasized, highlighting the theme of power dynamics.
• Invincibility Challenged: Hong Yi's previously unchallenged status as the strongest expert is shaken by Kid Buu's arrival.

Character Interactions

• Hong Yi vs. Kid Buu: A one-sided battle, with Kid Buu effortlessly overpowering Hong Yi, showcasing the vast gap between their abilities.
• Kid Buu's Intentions: Kid Buu's actions suggest he has a purpose in keeping Hong Yi alive, adding intrigue to their dynamic.

Key Plot Points and Events

• Kid Buu, a clone of Baros, battles Hong Yi, the destiny protagonist of the Yang God Great World.
• Hong Yi, severely injured, unleashes his three ultimate divine arts (Blood and Flesh Fusion, Soul Fission, Great Liberation Art) to boost his battle power significantly.
• Baros, through Kid Buu, senses Hong Yi's battle power surging from 4.5 billion to a peak of 9.7 billion, showing interest in learning these divine arts to further increase his own power.
• Kid Buu, unimpressed by Hong Yi's initial power, decides to help him raise his battle power further, increasing his own power to over 800 billion.

Character Developments

• Hong Yi demonstrates resilience and desperation, pushing his limits to fight Kid Buu.
• Baros reveals his ambition to close the gap with Beerus, the God of Destruction, by learning Hong Yi's divine arts.
• Kid Buu shows contempt for Hong Yi's initial power but expresses delight in finding a worthy opponent.

Significant Themes

• The pursuit of power and strength, with characters continually seeking to increase their battle power.
• The concept of worthy opponents and the joy of battle, as seen through Kid Buu's perspective.

Character Interactions

• Kid Buu and Hong Yi engage in a battle of power and will, with Kid Buu initially disappointed but later intrigued by Hong Yi's potential.
• Baros, through Kid Buu, interacts with Hong Yi, showing interest in learning his divine arts to further his own goals.

Key Plot Points and Events

• The earth and mountains tremble, and all living beings panic due to an immense pressure.
• Hong Yi, the protagonist, struggles against this pressure but refuses to yield.
• The world's Plane Origin begins to merge with Hong Yi, enhancing his power.
• Hong Yi transforms into a giant, his battle power reaching 299 billion.
• Kid Buu, the invader, is amused by Hong Yi's growth and decides to fight him seriously.
• Hong Yi unleashes his three great divine arts: Soul Fission, Flesh-and-Blood Fusion, and Great Liberation Art.

Character Developments

• Hong Yi: Grows from near defeat to immense power, fueled by the Plane Origin. Develops confidence to face Kid Buu.
• Kid Buu: Initially dismissive, becomes interested in fighting Hong Yi seriously after seeing his growth.

Significant Themes

• The power of the protagonist, enhanced by the world's origin.
• The fear and panic caused by overwhelming power.
• The struggle against insurmountable odds.

Character Interactions

• Hong Yi vs. Kid Buu: Initially unequal, Hong Yi gains power and confidence, leading to a climactic showdown.
• The Plane Origin vs. Kid Buu: The world's consciousness aids Hong Yi to resist the foreign invader.

Key Plot Points and Events

• Hong Yi, with a combat power nearing 300 billion, uses his signature technique, "Dark Grand Barrier," to trap Kid Buu.
• Hong Yi employs his ultimate ability, "Great Liberation Art," which reduces Kid Buu to a puddle of liquid.
• Kid Buu surprisingly recovers and returns to his normal state, shocking Hong Yi.
• Kid Buu, irritated by Hong Yi's persistence, unleashes his peak combat power (over 900 billion) and defeats Hong Yi with a single punch.

Character Developments

• Hong Yi: Demonstrates immense power and uses his ultimate technique, but underestimates Kid Buu's resilience.
• Kid Buu: Shows immunity to Hong Yi's powerful attack, revealing his extraordinary regenerative abilities.

Significant Themes

• Power and its limits: Hong Yi's immense power is challenged by Kid Buu's resilience, highlighting the limits of power.
• Underestimation: Hong Yi underestimates Kid Buu, leading to his defeat.

Character Interactions

• Hong Yi vs. Kid Buu: Hong Yi attempts to defeat Kid Buu but ultimately fails, showcasing Kid Buu's overwhelming power and resilience.
• Kid Buu's irritation: Kid Buu grows irritated with Hong Yi's persistence, leading him to unleash his full power.

Key Plot Points and Events

• Hong Yi, severely injured, faces Kid Buu, who is too powerful for him to defeat.
• Hong Yi is saved by the plane's origin power, but he understands he's still no match for Kid Buu.
• Kid Buu refuses Hong Yi's offer to spare him, revealing he's acting on orders from his "true self."
• Kid Buu attacks with powerful energy rings, and Hong Yi defends using all his might, causing catastrophic energy waves that threaten to destroy their surroundings.

Character Developments

• Hong Yi: Realizes his limitations against Kid Buu, shows willingness to compromise to protect his world, and acknowledges the existence of a more powerful entity behind Kid Buu.
• Kid Buu: Shows increased aggression, reveals he's following orders, and demonstrates his immense power with devastating energy attacks.

Significant Themes

• Power Imbalance: The vast difference in power between Hong Yi and Kid Buu highlights the theme of power imbalance and its consequences.
• Sacrifice for the Greater Good: Hong Yi's willingness to compromise to protect his world reflects the theme of self-sacrifice for the greater good.
• Hidden Forces: The revelation of a more powerful entity behind Kid Buu introduces the theme of hidden forces manipulating events.

Character Interactions

• Hong Yi and Kid Buu: Their interaction is characterized by Hong Yi's desperation and Kid Buu's increasing aggression, culminating in a devastating attack that puts both at risk.

Key Plot Points and Events

• Kid Buu severely wounds Hong Yi, turning him into chocolate and consuming him.
• Kid Buu escapes using Instant Transmission due to the collapsing world.
• Baros, controlling Kid Buu, sends him to the Tomb of the Various Philosophers for opportunities and treasures.
• Kid Buu finds the Longevity Emperor, Creation Daoist, and Dream God Machine blocking his path at the Philosophers' Mausoleum, all with extraordinary combat power.

Character Developments

• Kid Buu demonstrates his power and immortality by consuming Hong Yi and escaping danger.
• Baros shows his strategic mind by sending Kid Buu to the Philosophers' Mausoleum.
• The ancient powerhouses (Longevity Emperor, Creation Daoist, Dream God Machine) reveal unexpected survival and increased power.

Significant Themes

• Power and Immortality: Kid Buu's strength and immortality are emphasized.
• Fate and Manipulation: Baros controls Kid Buu and the plot, highlighting fate's role.
• Resurrection and Power Increase: The ancient powerhouses' revival and boosted strength hint at the plane origin's influence.

Character Interactions

• Kid Buu vs. Hong Yi: Kid Buu's power and cruelty are shown in his interaction with Hong Yi.
• Baros and Kid Buu: Baros controls and guides Kid Buu, displaying their symbiotic relationship.
• Kid Buu vs. Ancient Powerhouses: The confrontation at the Philosophers' Mausoleum hints at future conflicts.

Key Plot Points and Events

• Kid Buu's appearance instills fear in the Yang God Great World's Plane Origin Consciousness, leading to the resurrection of powerful figures like the Longevity Emperor and the Creation Daoist.
• Baros, Kid Buu's true body, orders Kid Buu to destroy the world if necessary, as he possesses the Primordial Dao Imbuement, which can suppress world origins.
• Kid Buu reveals he has eaten Hong Yi, the strongest being in the Yang God Great World.

Character Developments

• Kid Buu demonstrates his immense power, now more than twice as strong as before, instilling fear in the resurrected powerful figures.
• The Longevity Emperor, despite his immense strength and pride, feels powerless and overwhelmed when facing Kid Buu.

Significant Themes

• The fear of the unknown and the lengths world origins will go to protect their worlds.
• The vast disparity in power and the resulting helplessness and despair.

Character Interactions

• Baros and Kid Buu: Baros orders Kid Buu to destroy the world if necessary, showing their symbiotic relationship.
• Kid Buu and the resurrected powerful figures: Kid Buu's immense power instills fear and disbelief in the Longevity Emperor, Dream God Machine, and the Creation Daoist.
• Kid Buu and Hong Yi: Kid Buu casually reveals he has eaten Hong Yi, showing his disregard for the world's strongest being.

Key Plot Points and Events

• Kid Buu attacks Longevity Emperor and Creation Daoist, but his attacks pass through them as they are merely soul bodies.
• Longevity Emperor reveals they've been dead for years and are only souls wandering between heaven and earth.
• Baros realizes their true state and orders Kid Buu to attack with ki.
• Kid Buu uses a barrage of donuts to destroy the Tomb of the Various Philosophers, severely injuring Longevity Emperor and the others.
• Kid Buu turns the injured souls into chocolate and swallows them.
• The space containing the tomb begins to collapse, and Baros decides to leave the Yang God World.

Character Developments

• Longevity Emperor and the others are revealed to be souls, not resurrected.
• Kid Buu shows adaptability in battle, switching to ki attacks when he realizes his physical attacks are ineffective.
• Baros shows impatience and lack of interest in Longevity Emperor and the others once he understands their true state.

Significant Themes

• The fragility of life and the power of souls.
• The destructive power of Kid Buu's attacks and the consequences of his actions.
• The indifference of powerful beings towards weaker ones.

Character Interactions

• Baros orders Kid Buu to kill Longevity Emperor and the others.
• Kid Buu follows Baros's orders, showing no mercy towards the souls.
• Longevity Emperor and the others show no fear or desire, accepting their fate calmly.

Key Plot Points and Events

• Kid Buu, now under Baros's control, returns from a mission where he found his opponents too weak.
• Baros refines Hong Yi, a captive from the Yang God World, using the Dragon Elephant Prison-Suppressing Scripture to obtain his knowledge and planar origin.
• Baros's power grows rapidly during the refinement process, causing tremors in the Universe and drawing the attention of powerful beings like Bardock and the Xue Saiya sisters.

Character Developments

• Kid Buu: Despite being controlled by Baros, Kid Buu retains some of his former personality, complaining about weak opponents and being reluctant to give up his power.
• Baros: Baros's power increases significantly as he refines Hong Yi, further cementing his status as a formidable force in the Divine Martial Star System.

Significant Themes

• Power and Growth: The chapter emphasizes the continuous growth and increase in power of characters like Baros and Kid Buu.
• Control and Manipulation: Baros's control over Kid Buu and his refinement of Hong Yi highlight the theme of one character's power being used or manipulated by another.

Character Interactions

• Baros and Kid Buu: Baros's relationship with Kid Buu is one of control and dominance, with Baros often being exasperated by Kid Buu's behavior.
• Baros and Other Characters: Baros's actions draw the attention of powerful characters like Bardock and the Xue Saiya sisters, hinting at potential future interactions or conflicts.

Key Plot Points and Events

• Baros easily refines Hong Yi's power and absorbs his cultivation techniques and martial arts.
• Baros enters seclusion to integrate the absorbed knowledge, including the peerless art 'I Ching'.
• In one year, Baros raises his realm to match Hong Yi's, enhancing his control over his power.

Character Developments

• Baros: Absorbs Hong Yi's power and knowledge, raises his realm, and gains profound comprehension of the Heavenly Dao.

Significant Themes

• Power and Knowledge Acquisition: Baros's strength grows through absorbing Hong Yi's power and knowledge.
• Self-Improvement: Baros dedicates himself to enhancing his realm and understanding of the Heavenly Dao.

Character Interactions

• Baros and Hong Yi (indirectly): Baros benefits from Hong Yi's power and knowledge, though Hong Yi is not present in this chapter.

Key Plot Points and Events

• Baros derives a martial scripture from the Human Immortal realm for the Saiyan race.
• A year passes, and Baros plans to form a Super Saiyan battle team to conquer other Universes.
• Saiyans train rigorously, elevating their overall power and forming powerful battle teams.
• Bulma, Nie Xiaoqian, and Lazuli consume Tree of Might Fruits and advance in their Immortal Dao realms.
• Broly significantly improves his strength, touching the bottleneck of Legendary Super Saiyan 4.

Character Developments

• Saiyans: Overall strength increases dramatically, with numerous Super Saiyan 1, Full Power, and 3-level warriors emerging.
  • Xuesaiya: Battle power reaches 130 billion.
  • Xueseli: Battle power exceeds 100 billion.
  • Paranti: Battle power reaches 150 billion-plus.
• Bulma & Nie Xiaoqian: Become Golden Immortal great powers, with battle power above 3 billion.
• Lazuli: Advances to Great Unity Golden Immortal level with 6.3 billion battle power.
• Broly: Achieves Legendary Super Saiyan 3 with 790 billion battle power and nears Super Saiyan 4.

Significant Themes

• Training and self-improvement.
• The power of teamwork and unity among Saiyans.
• Advancement in realms and battle power through consumption of resources.

Character Interactions

• Baros aids Saiyans in their training and development.
• Saiyans train together, forming powerful battle teams.
• Bulma, Nie Xiaoqian, and Lazuli support each other in their Immortal Dao cultivation.
• Broly, Kakarot, and Bardock engage in intense training to improve their strength.