Naruto was tired. He had a reason to be the sun had not even risen, yet he was awake. The reason for him being awake once again disturbed him. "Yosh, Gai-sensei I have completed my 50th lap only 450 more to go."
This must be a dream. No way is there a man and his clone doing laps around his house at 4:30 in the morning.
"51", Naruto heard and he was in complete disbelief, this was no dream, it was a nightmare. After five more laps Naruto was able to gather his resolve to go yell at whoever these insane people were.
"Who are you and why are you awake right now?" Naruto exclaimed. "We are fanning our flames of youth" replied the older man, "Would you like to join in?"
I'm going insane. There's no way that's his excuse.
Yosh, do you want to be a ninja?" the younger one asked. "Of course I do, I'm Naruto Uzumaki, future Hokage of Konoha!" Naruto responded.
"Well then young one, you should join in" likely the one called 'Gai' said. "Lee here is one of my genin students is working to improve his stamina, which is one the most important parts of being a ninja"
"Aren't jutsu more important?" Naruto asked inquisitively. "They are important, but every ninja needs to be able to be able to fight for long periods of time. Usually a battle takes longer than a minute and it is important to be as fresh as possible in a long battle." Gai responded.
"Also, Lee is not just training stamina by running he has weights which improves his leg strength" Gai explained. "Yosh, since training under Gai-sensei I have gotten so much stronger, I was the dead-last and now I can compete with the rookie of the year" Lee exclaimed.
"Really?", Naruto questioned. "If you're so strong how about we have a spar and you prove it . I'm in the academy and I bet I could destroy you" There is no way I lose to this kid with a bowl cut and green spandex.
Gai-sensei, is it okay if I spar with Naruto-kun?" Lee asked. "Of course, this would be a quite youthful activity to see how much you have improved"
"Meet me at the training ground in an hour, and be ready to lose!"