Some ideas that work for us: Hullabaloo by Cranium (instructs you to jump to a triangle, crawl to a picture of a musical instrument etc.) My younger son (19 months) can't really follow the directions but he has a blast jumping from spot to spot trying to follow his brother (age 3 1/2). Another fun game for 3s and up in HyberDash. We received them both as gifts and the kids really run around with them.
When my first son was younger, we'd play "Find all the balls in the house and throw them in this laundry basket, try to beat the timer, etc. " He would even be happy to have a jumping contest, etc. Anything I was willing to time.