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Backside Boost: Works: Butt, Lower Back, Abs, Hips Start in push-up position with shins on top of ball. Lift left leg (as shown), hold for 1 count, then return to plank. Repeat on opposite side for 1 rep. Do 12 reps. Source: Larsen & Talbert
Want to look amazing in an open-back dress? Do this move: Anchor a band at floor level around a sturdy piece of furniture. Lie facedown, arms in front of you; grip handles. Lift chest, arms and legs off floor as you bend elbows and draw shoulder blades together. Hold; return to start for 1 rep. Do 3 sets of 15 reps on alternate days.
The Superman: Lie across a stability ball, feet hip-width apart and resting against a wall or other sturdy object. Your arms should be extended past your head, with your palms facing each other. Squeeze your glutes and lift your chest off the ball to straighten your back while reaching your arms overhead. Pause, then slowly reverse the motion to return to start.