This is a challenging abdominal oblique exercise.

1. Sit on the balance pad with legs bent, heels resting on the floor. Keep your shoulder blades down, core engaged, and chin tucked toward your chest. Lean back, keeping your arms resting lightly on your thighs.

   

2. Exhale and lift your body, turning slightly to the left, reaching your right hand to the outside of your left knee. Inhale and return to the start position, then repeat to the other side, reaching the left hand to the outside of the right knee. Repeat 10-15 times, rest, then repeat the exercise if desired. Variation: You can also do straight crunches without twisting the body.