This content is from the experts at Men's Fitness magazine.
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Time: 1 minute
Lie on your back on the floor with your fingers laced behind your head. Straighten your left leg while simultaneously bringing your right elbow towards your left knee. Switch sides, bringing your left elbow towards your right knee.
It's working when you are alternating sides in a pedalling motion and your shoulders are off the floor while keeping the tension in your abs.