Get ready to feel every muscle in your body working—this hardcore squat is a killer!
How to do it: Stand on your right leg and extend your left leg out as straight as you can in front of you. Reach your arms straight out towards your left foot. Lower into a deep squat on your right leg, going as low to the floor as you can (without lifting your heel off the floor), and then press back up to standing. That's one rep. Work up to 10 reps on one leg, and then repeat on the other side.
These are much harder than they look, so feel free to hold onto a wall or a chair as you build your strength and balance with this exercise.