This week's workout comes from John at Synergy. Add a cable to your regular split squat and deadlift to really engage your core.

With the cable at shoulder level, it could pull your body. By using your core, keep your body upright for a deep split squat. After 15 reps, step a few feet back and on the same front leg, slowly lower yourself to a one-leg deadlift with the cable in front of you. Don't forget to switch sides!