Begin in a plank variation with your feet slightly wider than your hips.
Bring your right hand to your left shoulder, then place that hand back on the mat. Bring your left hand to your right shoulder and return it to the mat.
Bring your right knee and your left hand toward one another under your body. Return to a plank, and switch sides so your left knee meets your right hand.
This competes one rep. Do 10 reps total.
This plank variation works the entire body! But your abs better kick into gear to keep you stable.