After obtaining the cultivation method for Talent of the Immortal Clan from Master Yamashita, Uchiha Shin didn't plan to start training right away.
The reason was simple. Uchiha Shin's physical abilities hadn't yet reached the peak of what he could achieve at his current level.
Physical abilities generally referred to the strength, speed, endurance, agility, and flexibility a ninja displayed in battle.
So improving one's physical abilities was obviously beneficial to every ninja.
Talent of the Immortal Clan was also connected to a rudimentary use of Natural Energy.
To master and learn Talent of the Immortal Clan perfectly, he would need to start from the best physical condition he could achieve at this stage.
As the saying went, "If the foundation isn't solid, the whole structure will shake."
Thinking of this, Uchiha Shin forcibly suppressed his desire to learn Talent of the Immortal Clan.
Why did Uchiha Shin place so much importance on Talent of the Immortal Clan?
The reason was simple: the technique had no limit to its potential.
Uchiha Shin could say with confidence that Talent of the Immortal Clan was the only technique in Naruto that could compete with Complete Body Susanoo and Sage Art: Wood Release: True Several Thousand Hands.
Unfortunately, the original Naruto anime from his previous life devoted very little time to describing this secret Fire Temple technique.
Why was Uchiha Shin so certain about Talent of the Immortal Clan?
To understand that, he had to bring up two key concepts: Yin Release and Yang Release.
Yin Release represented spiritual energy, and Yin Release techniques could create material forms from nothing.
Yang Release represented physical energy, and Yang Release techniques could breathe life into a form.
The Uchiha Clan's mighty Susanoo used Yin Release to control and materialize Chakra, making the power of Yin