Why bicep curls?
Other than that (and the fact that this should be in the fitness section...I'll move it momentarily) you have jump squats, box jumps, broad jumps, one-legged jump squats, depth jumps, lateral lunges, power lunges...I'm sure there are more.
As for balance, try walking rails forwards, backwards, slow, stopping, eyes closed, doing pistols on a rail, two-footed squats, cat balances, precision jumps, one-legged precisions, turns and pirrouettes on a rail, etc.
Check out the fitness section on the main page. Also keep an eye out for a jump program that I should have up in the next couple of weeks.