To do bicycle crunches, lie flat on your back with your hands resting behind your head, and alternate touching opposite elbows and knees. You need a mat and comfortable clothing.Continue Reading
First, lie flat on your back. Put your hands behind your head and lift your shoulders slightly. Bend your knees until your lower legs are perpendicular with the floor.
Bend your torso and move your right elbow across your body toward your left knee. At the same time, move your left knee up to meet your elbow. Return to your starting position and repeat the process with the left elbow and right knee.
Continue the exercise until you have reached the desired number of crunches.