Press into the floor with your hands and use your shoulders and core to move back to starting position.Lower your head slowly while you raise your body.Push your hands to straighten your torso.Keep your knees straight and your toes pressing into the bench.
The support should be at least half your height. Make sure it has free space all around it to prevent injury in case you fall. If you are a beginner at the 90 degree push up, you can try this method instead: All your weight is supported by your hands. This is whereby your body is parallel to the ground. It is an advanced level of push up you can aspire to after you have mastered floor push-ups and pike push-ups. The 90 degree push up is an exercise that is done by handstands.
