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This exercise is all about learning how to "brace" the abdominals in the supine plank position.

Come into the supine plank, positioning the low back off the front of the dome - not directly on top.  Lean back until you feel the abdominal muscles contract enough to keep your torso upright and hold right there.  Leaning back any further will actually cause your abdominal muscles to relax as you move into extension rather than flexion.  From that plank position, let the breath flow evenly in through the nose and out through the mouth while maintaining the contraction or "brace" in the abs.

Inhale and extend your arms out alongside your legs.  Exhale and wave your arms up overhead, alongside the ears.  Continue with the "jumping-jack" arms, synchronizing the breath with each arm movement.

As you begin to feel "the burn", keep breathing and think about how solid and strong you are building your core!