1. Assume a one-arm plank position with your feet spread several inches wider than your shoulders.
  2. Your weight-bearing arm should be positioned so that your wrist is directly under the same-side shoulder.
  3. Place your non-weight-bearing arm on the opposite hip or behind your back.
  4. Don't let your head or hips sag toward the floor.

Related:  The Athlete's Guide to One-Arm Push-Ups

Related:  The Very Best Push-Up for Pecs & Power