Lie on the ground with your feet resting on top of a stability ball. Your knees should be bent and your hands planted on the ground, one to each side. Next, raise your hips upward and lift one leg ...

Lie on your back with your knees bent and feet flat on the floor. Lift your hips until your body forms a straight line from your knees to your shoulders (A). Slowly extend your left leg until it's in ...