Jillian Michaels' Calorie-Burning Workout
Crunch circle with hollow man
Lie face up, hands resting lightly on back of head.
Raise legs 3-6 inches; contract abs. Crunch torso up, then rotate it so ribs draw a clockwise circle.
Repeat in opposite direction.
Next: Side squat with figure 8
Get the latest health, fitness, anti-aging, and nutrition news, plus special offers, insights and updates from Health.com!