Side Bridge (a.k.a. Side Plank)

Side Bridge: Lie on your right side, holding your legs straight, your right palm on the floor, and your feet stacked on top of each other. Straighten your right arm, keeping it in line with your shoulder, and then place your free hand on your opposite shoulder. Hold this position for as long as possible, and then repeat on the opposite side. Note: This is a static exercise: no movement should occur once you assume the correct position.