Step1: Lie on your back with your legs stretched in front of you.
Step 2: Bend your knees and plant your feet firmly on the floor, hip-width apart.
Step 3: Put your hands behind your head, but do not clasp them together.
Step 4: Contract your abs and lift your knees to 90 degrees and raise your upper body. This is your starting position.
Step 5: Exhale, rotate your trunk and move your right elbow and left knee toward each other. At the same time straighten your right leg.
Step 6: Pause, inhale and return to the starting point.
Step 7: Exhale, move your left elbow to your right knee and extend your left leg. This completes 1 repetition if bicycle crunches