The bicycle crunch is the best ab exercises you can do, reaching not only the usual abs but also the deep abs and the obliques. If you want to work your core, this air bicycle maneuver is a great choice. It’s a no-equipment, beginner’s level exercise you can do anywhere. Use it as part of your core strengthening workout or add it to a full body workout.
The bicycle crunch is excellent for activating the rectus abdominis, your upper abdominal muscle, and it is second only to the captain’s chair for activating the obliques—your side abdominal muscles. Because you are raising your legs, you also engage the transverse abdominis, which is the deep ab muscle that is hard to target. Besides working your abs, you will also be toning your thighs as both your hamstrings and quads will be involved with bicycling.
A strong core will help