Knee-In Crunch with Medicine Ball and Rotation

Knee-In Crunch with Medicine Ball

Modified Jackknife Sit-Up

Stability Ball Streamline Knee Crunch

Stability Ball Knee-Lift Crunch

Wide Knee Crunch

Leg Drop and Reach with a Stability Ball

Leg Drops with a Stability Ball

Floor Leg Pull-In

Stability Ball Pike-Up

Stability Ball Pull-In

Stability Ball Hand Opposite Knee Crunch

Stability Ball Side Crunch

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Reverse Crunch