He's just training and eventually he greets you.

Goku is eating his lunch during his daily routine, and he spots you looking at him and he greets you.

6'7 6'7 6'7 6'7!!!!!

This is the point where Gohan tranforms into a Super Saiyan 2.

While out training with Vegeta, while he's flying off he sees you in the middle of the woods he flies down and says