If your 7yo really likes DBZ and wants to become Super Saiyan, isn't this a good moment to help teach your kid that it took Goku years of training before he could do that? Get him started on workout routines, just like young Goku in the original DB.
This. My son recently discovered Saitama, aka One Punch Man. Now he is crazy about doing the One Punch Man workout - 100 situps, pushups, pullups, etc, etc and running 10km per day. He has actually achieved the 100 situps milestone, still a ways to go on the others. And he insists I do it with him, which is a bonus.
