1. Side Plank with Leg Extensions
Works: obliques, trunk, abductors (outside of hip), and shoulders
Lie on your side with your elbow directly under your shoulder. Keeping both feet flexed, use your obliques to lift your hips- don't arch your back! Lift your right leg and crunch it in. Extend your leg back out for one rep, then lower it. Repeat 10 times, then switch to left leg.