Full Push-up:

Start with your wrists under your shoulders. Keep your elbows from locking and your spine in line. Keep your head facing the ground. Lower your body to the ground, exhale, and push up to starting position.

Knee Push-up Modification:

Start with your wrists under your shoulders. Keep your elbows from locking. Place your knees on the ground, keeping your spine in line. Lower your body to the ground, exhale, and push up to starting position.