This move makes a traditional crunch twice as hard, but it's definitely worth the effort. "The double crunch is another move that will hit your entire core, but it is easy to forget form so be sure to move slowly through each rep to see optimum results," Kendall said.
- Lie flat on the floor, with your arms at your sides and your legs stretched out in a straight line.
- With your core engaged, crunch your torso forward so your shoulders are just off the floor. At the same time, lift your legs toward the ceiling and reach your arms upward, as though you're trying to touch your toes.
- Your arms and legs should look like two parallel lines, with your butt and shoulders just slightly off the ground.
- Return to the starting position without letting your arms or legs rest on the floor. That's one rep.
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