health
7easy moves to tone and tighten your bum …
4. 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.