Sit on stability ball and walk feet forward until upper back and shoulder blades rest on the ball with knees bent at 90 degrees and feet flat hip-width apart. Place hands lightly behind head with elbows flared.

1. Engage core by drawing navel to spine.
2. Exhale and crunch forward while twisting torso to bring left elbow toward right knee and right knee toward chest.
3. Hold contraction briefly, then inhale and return to start controlled.
4. Repeat on opposite side, bringing right elbow to left knee and left knee to chest.
5. Alternate sides in a smooth pedaling motion.
6. Maintain control without momentum.