Stand with your feet together as if you were holding a jump rope (if you have one handy, feel free to use a real one!). Jump once in place, and then bring your right knee up in front of your hip as you hop again. Jump again with feet together, then hop and lift your right knee out to the side of your hip. Jump again with feet together and repeat the pattern with your left leg. Keep switching sides, jumping in place for 1 minute.
Form tip: Land lightly on the balls of your feet to avoid making too much noise or straining your feet.