4. Prone Leg Lifts over a Ball

Prone Leg Lifts over a Ball

Lie with your stomach down on an exercise ball with your hands on the floor. Tighten your glute muscles and lift one of your legs slightly off the floor while you keeping leg straight, then alternate sides. If you’re looking for more of a challenge, try lifting both legs up at the same time, as long as you can do so without straining your back.

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