Doing a basic crunch with a twist at the end works your oblique muscles. Because of the twisting motion, your obliques are targeted along with your abs. This exercise focuses on working the upper body and training your core.
If you find the following exercise challenging but are able to maintain proper form while doing it, then you’re working out at the right level for you.
Lie with your back on the ball and your feet planted firmly in front of you.
Make sure that you have your heels directly below your knees. Your shoulders don’t touch the ball, so they’re free to move from side to side.
Place your arms criss-crossed on top of your chest.
You should exhale before you contract your abdominal muscles.
Starting with your right shoulder, slowly lift and turn your body toward your left hip.
Remember to contract your abdominal muscles as you perform this step.
Stay lifted for a moment, and then slowly lower your body down to the starting position.
Remember to inhale as you release your back down onto the ball in starting position.
Slowly lift your left shoulder as you contract your abdominal muscles and turn your body toward your right hip.
Continue alternating your right and left side lifts, doing two sets of 12.