Quote Originally Posted by Rye
I never thought about it at first, but then it just hit me.

"Why are those kids more ripped than about 80% of men?"
Because they are half Saiyan and half human, and half human and half saiyan is called super-saiyan and they are really strong. Gohan´s power level was 981 at age of 5 and a normal farmerdude had just power level of 5 so if they are that strong, they have to be ripped. IN TOU FACE!