Time: 30 seconds
How to do it: Lower into a squat and bring your arms in front of you. Jump your feet together, still holding your squat position, as you swing your arms back by your sides, keeping your elbows bent (as shown). ‘Jack’ your feet out and in as quickly as you can without coming up out of your squat.
Form tip: Maintain proper squat form as you do your jacks—keep your knees behind your toes and your hips behind you as if you were sitting in a chair.
