Digido Interactive, a Vancouver developer that aims to encouraging fitness in youth, has launched Pop & Dodge, an iPhone game that requires players to physically jump in order to dodge balls and collect powerups.
The free game's premise is simple: a penguin named Beeker plays dodgeball (one-sided Dodgeball, that is; you never get to throw balls back at the enemy). And essentially, the only control is jumping.
I'm not certain of the physics the game requires to activate the jump, but it didn't always work for me. When it did, the game was relatively fun—a throwback to high school gym class, only without the fear and pain.
Unfortunately, though, I usually got a game over because my jump in real life didn't translate into Beeker jumping and he got slammed with a firey red ball (R.I.P. buddy). Alternatively, I tried to rig it by triggering jumps with arm and hand movements while my feet were planted firmly on the ground; this worked sometimes, but not often.
Maybe Pop & Dodge's jumping mechanics work better for kids. I don't know. But I did get a workout from testing it, so it does the job… sort of.