Lie face-up with legs together, raised toward ceiling, feet flexed, hands behind head, elbows out, shoulders lifted. Lower left leg until it hovers above floor (as shown). Return to start. Repeat with right leg for 1 rep. Alternate sides for 30 seconds 3 times. Target: abs
Lie face-up with arms extended overhead, palms up. Contract abs and draw knees toward chest as you lift upper back off floor and grab soles of feet with both hands (as shown). Hold for 10 seconds. Return to start; repeat. Do 15 reps. 3 set. Target: abs
Stand with feet hip-width apart, arms above head, palms pressed together, elbows out. Lean to right (as shown), pushing left hip out, until you feel your obliques and back engage. Return to start; repeat on opposite side for 1 rep. Do 12 reps 3 sets.
67% better than a crunch at activating your lats, which pull in your waistline