For a bicycle crunch; lie down on the yoga mat with a tall torso and knees up and legs raised; so that your knees are parallel to your chest. Place your hands on the back of your head; with elbows bent outwards; and a support for your neck. Slightly raise your shoulders, giving yourself a core crunch. Now, the bicycle crunch starts; pull your right knee in towards your core and simultaneously pull your left elbow in; making them contact. Do the same with your left knee and right elbow. Keep on doing so repeatedly by alternating sides and your bicycle crunch is complete.
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