Lie prone on floor with hands under shoulders or slightly narrower. Position body up off floor with extended arms and body straight. Partner can place weight plate(s) on back if needed.
Keeping body straight, lower body to floor by bending arms. Push body up until arms are extended. Repeat.
Both upper and lower body must be kept straight throughout movement. Exercise can be performed without additional weight (See Close Grip Pushup without weight). If additional weight is used, partner will need to add and remove weight, and keep weight from sliding off back. See wider grip push-up.