Wolf is in Martial Arts. His school suggests that the younger kids only go two days a week. The reasoning is that it stays a treat and they don't burn out or get bored with it.
Wolf's main goal in life (when it isn't to build a lightsaber) is to earn his next belt. If your son doesn't balk too much, likes this physical activity the most of what you've tried (possibly because it is non-competitive?), and you think he'll enjoy it, I'd suggest trying to get him enthused about earning his next belt. Personal incentive is a good thing...
