The Power Abs Workout

Jackknife

Targets shoulders, back, abs, obliques, and legs

• Stand with feet shoulder-width apart, arms extended overhead; lift right leg about a foot off floor, toes pointed.
• Hinge forward from hips and reach hands to toes.
• Keeping right foot lifted and back flat throughout, straighten up to standing start position as you lift arms overhead, then place right foot on floor.
• Switch sides and repeat. Do 10 to 12 reps, alternating sides.

Originally published in FITNESS magazine, September 2012.