Set-up: Set up on the floor resting on your elbows and toes, with your method of external weighting prepared.
Movement: Place your elbows in line with your shoulders and raise up onto them by lifting them hips up until they form a straight line together with your feet and shoulders. Brace through the core and maintain proper posture throughout.
Emphasis: Do not allow the hips the sag, or the butt to flare up above the back. Keep the shoulder blades back and together. It may be helpful to visualize proper standing posture - the posture here is the same, only your body is rotated 90 degrees toward the floor.
Optional weighting: Weighting can be accomplished with chains, band tension, a training partner - or an assisted loading of plates.