Kenzo started with Soru. He tried to kick his feet 10 times in a single second. But only managed to do it 6 times in a single second.
He needed to make his legs faster so he started to run at the fastest Speed possible for 100 meters and then did it again and again until he was tired.
After recovering, he would try to practice kicks by kicking a sandbag at the fastest Speed possible.
His aim was to make his leg muscles like steel while also retaining their ability to move.
'It's a leg day everyday.' It's what Kenzo thought whenever he trained Soru.
Kenzo had analysed the Rokushiki techniques deeply like many martial arts styles, the foundation of Rokushiki techniques would be primarily focused on building the leg strength over everything else which means being able to run fast, jump far, etc.
So the first and easiest technique that he could acquire would be Soru. The sudden burst of speed at elementary mastery of the technique would be helpful and when mastered, It would help him get to the blind spots of the target with ease.
The next stage in his training would be to continue focusing on his leg strength, but raising it to its maximum.
During this stage of training, he would be learning Geppo, Tekkai and Rankyaku simultaneously.
He would need to strengthen his leg muscles to the point that they become like steel, but also maintain their ability to move. This would help him learn Tekkai though only with his legs.
Learning Tekkai and Soru would give his legs enough strength and speed to use his kicks to use projectile attacks while kicking in the air. This would make him learn Rankyaku as well as help him learn Geppo.
The third level of his training would not just be training the body but also honing the knowledge of the anatomy of the human body. It means knowing how his muscles behave, how they constrict and stretch and how his body would generally respond to damage and stimuli.
While training the rest of his body, he would be able to use Tekkai with the rest of his body.
This is where Kenzo thought Kami-e came into play. By analysing his body, he would be able to know which muscles he could move flexibly. While also trying to learn Shigan. He beleived that Shigan is the ultimate expression of precise strength and control over your body so learning Kami-e would help him.
The last stage of training was to have combat training with someone to know how to use these techniques in a battle as well as to completely learn Kami-e.
During the battles, he would have to analyze the target's movements and their bodies at a glance, and then predict where a strike would come from and then move that part of his body to avoid the hit. (By using Kami-e)
Kenzo followed this training routine.He trained for months without much rest. His determination shocked Garp. Not only his determination but also his talent was remarkable. He managed to learn these techniques in a very quick time.
After five months, Kenzo moved to the large stage in his training that was to have combat experience.
And his opponent was none other than Garp.
Kenzo knew Garp's strength was scary.
Garp in the future would storm into Blackbeard's territory where there were thousands of pirates just to save Coby.
He destroyed the town with his move called the 'Galaxy fist'. And that was when he was old. Right now, he was a lot younger. [A/N: It's in manga latest chapters.]
Both of them stood on a training ground ready to duel it out.
"Be careful kid, I don't want to kill you in case I can't control the power. Hahahaha" Garp laughed as he rolled up his sleeves.
Kenzo had a dark expression on his face as he asked "Why would you even think of killing me? Am I not your nephew?"
'Soru'
Garp appeared in front of Kenzo in an instant and Kenzo was caught off guard by Garp's lightning-like speed as Garp slapped him.
'So Fast. Even with my spatial awareness, I couldn't even sense him until he appeared in front of me.'
Kenzo looks like you have not trained Kami-e properly. You could have easily dodged that attack with it.
"Kid now it's your turn to attack." Garp said with his arms closed on his chest as he stood grinning.
Garp's strength further strengthened Kenzo's desire to become stronger.
'Soru'
This time Kenzo used Soru as he appeared in front of Garp but he was not as fast as Garp. He kicked Garp but Garp easily dodged it.
'Soru' 'Rankyaku' 'Tekkai' 'Shigan'
Kenzo used all the moves that he had learned over and over again, but he didn't even touch the corner of Garp's clothes. Garp used Kami-e to dodge some of the attacks.
Seeing such a huge man with such flexibility surprised Kenzo.
Kenzo stopped as his sweat fell down his cheek. He saw that Garp was completely fine and was yawning.
Kenzo first thought that Garp was using observation haki to dodge all the attacks but knew that he was not using it. Garp was teaching him the Rokushiki while fighting him.
He had already shown him the true strength of Soru and Kami-e.
He had to improve himself during the fight like those main anime characters.
'If I can use my devil fruit powers. I may have a chance to at least connect with one attack.' Kenzo thought