Whether you’re aiming for a six-pack, or just want to keep your core strong, your abdominals are where you need to place your focus. Most workouts involve stimulating the rectus abdominis and obliques, but there is another muscle that will give you the most bang for your buck.
Located deep within the abdomen, the transverse abdominis has earned the nickname of the “corset muscle” because its fibers pull in the core from the front and back and help to stabilize the spine.
Stand straight up, with your arms extended above your head. You can stand with your back to a wall if this is easier.
Attempt to elongate your back by using arms to pull your torso upwards. While doing so, you may tighten your buttocks.
Remain in this position until you feel a pulling sensation in your abdomen. Hold for as long as you can. That is one rep. Repeat 10 times.