Assume a pushup position, but extend one arm out to your side so it’s perpendicular to your body and only your fingertips touch the floor.
Squeeze your glutes and quadriceps, and brace your core. Maintain these contractions for the entire movement. Don’t let your hips sag.
Bend your working arm and lower your body until your chest nearly touches the floor. Pause, and push yourself back up. Try to use your extended arm as little as needed.
To make it easier, move your extended arm closer and allow it to assist more.