If one of your fitness goals is to master a pushup, but you are not sure where to start, the Wall Pushup is a great place.
Find a wall and while keeping your body straight, lean forward until your arms are on the wall at about the height of your chest. Your thumbs should be pointing toward your chest so that your arms are at about a 45 degree angle to your body.
Lower your body to the wall keeping the entire body straight. Brace your abs and glute muscles to maintain stability and keep the body straight.
Push against the wall until your body is straight again. repeat for two to three sets of 5-10 repetitions two to three tomes a week.
Once you are able to do a wall pushup with good form, move your feet further from the wall and lower your hands on the wall to increase the amount of force you have to use to complete the pushup. As you become stronger continue to lower your body on the wall.
Work with a personal trainer to make sure you are using correct form.