By Health.com
Updated: April 18, 2008

Bicycle
for abs
Lie on your back with knees drawn in toward your chest and hands behind your head, elbows wide. Lift your shoulders and head off the floor. Extend your right leg at a low diagonal and twist your shoulders to the left, drawing your right elbow toward your left knee; do the same on the opposite side. Repeat sequence for 1 minute.

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