Because that was also the only thing they could do at their young age.
What surprised Xia Le was that all three had considerable talent. Nagato, in particular, had sensed the energy known as chakra on his very first day.
"Your training is simple!"
"It involves extracting chakra from deep within your body's cells, then learning to master that energy."
"Exercises like walking on water and climbing trees will improve your sensitivity to chakra and your control over it."
Xia Le spoke softly.
Watching the three repeatedly fall from the tree trunks and hit the ground hard, he smiled.
He had little interest in the Second Great Ninja War. By contrast, Nagato and the other two had captured his attention.
Drawing on the original host's training experience, he deepened his own understanding, organized what he had learned, and taught it to the three.
"Keep going!"
"We'll train as we travel."
Xia Le smiled faintly.
All three were quick learners, and the suffering they had endured during the war had made them even more resilient.
Now that they had their first taste of power, they immediately threw themselves into training with boundless enthusiasm.
Because all three understood that, for them, power meant survival.
"Yes, teacher!"
The three shouted in unison.
And so the four traveled through the interior of the Land of Rain, following the forest southeast.
The battlefront between Konoha and the Rain Ninja Village lay where the Forest of Konoha met the Land of Rain. Of course, it was not a continuous line, but was concentrated around the center.
After all, neither side had many ninja, and Konoha was fighting on several fronts in this war.
The Land of Rain was in an even worse position. With little territory and a sparse population, it could barely muster any ninja