Jumping jacks: Jump your feet out to the sides while raising your arms overhead, then jump back to starting position.
Burpees: Start in a standing position, then squat down and place your hands on the ground, jump your feet back into a plank position, jump your feet back up to your hands, and stand back up.
High knees: Run in place while bringing your knees up towards your chest as high as possible.
Bonus tip: Incorporate these exercises into a circuit workout for maximum results.