Best Belly All-Around. 4)Hip Airplane.

4. Hip AirplaneStand with right leg extended behind you so foot is off floor. Raise arms to shoulder height like wings, palms down. Contract abs and hinge torso forward about 45 degrees as you raise right leg behind you as high as possible, while maintaining balance and keeping hips level. Hold, then lower leg to stand and repeat. Do all reps, then switch legs.

Make it easier Lift leg behind and balance without hinging forward with upper body.Make it harder From Main Move, rotate body to right, raising right arm so chest and hips face right and left arm points toward floor (shown). Hold, then rotate to left. Hold and return to center for 1 repetition. Do all reps, then repeat with opposite leg lifted.