@givemersspls you never seen the samurai jack episode where he learns to jump good? it's not about strength, it's about will. the training was to beat the fear out of them not to make them strong.
@givemersspls The Rabbit Tribe's only flaw was their cowardice. When compared to Elfs who can use magic, the Tigers and Bears with their high physical strengths, no one else can beat the Hualia Tribe in Stealth and Speed.
Hajime just gave them the Spartan treatment of removing their fear, and the end result is a bunch of Bloodthirsty Chuuni Assassins.