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SWISS BALL HAMSTRING CURL – Start with heels on top of the ball and arms on the floor at your sides with palms facing upward. Raise the hips so that your body is in a stright line from shoulders to feet. Draw the ball towards you ensuring that your hips stay lifted. Brace stomach throughout movement and keep the back straight.
Easier option – start with calves on the ball
Harder option – single leg

Hillcliffswissball hamstring curl