How To Properly Perform A Push-Up

The primary muscles involved in a push-up are in the chest and shoulder region. As you view the video, watching incorrect versus correct form, compare the movement of the shoulder blades. Incorrect movement, lack of shoulder stabilization, places more emphasis on the latissimus dorsi (and other muscles) whereas correct movement emphasizes shoulder stabilization and chest muscle action. Bottom line: During the movement, focus to keep  your shoulder blades stable by tightening your armpits.