The Ultimate Lunch-Hour Workout

Single-Leg Bridge

Targets: Butt, hamstrings, and quads

• Sit on floor with knees bent, feet flat, and rest upper back and shoulders against a stability ball with arms slightly out to sides, fingertips lightly touching floor for balance.
• Keeping right foot flat on floor, lift left leg and bend left knee out to side, resting left ankle on right knee.
• Press hips up, rolling upper back on top of ball as you squeeze glutes and raise pelvis so it's level with shoulders and right knee. Hold for 1 count, then lower to complete 1 repetition.
• Do 10 reps. Switch legs; repeat.

See a video of this move