There is more than one way to do a push-up. If you are going to do 100 push-ups, then doing them correctly is of vital importance. Form and positioning of your body are key to performing 100 push-ups.
- Get in plank/push-up position
Start on your hands and knees and move in to the plank position, with your arms about shoulder width apart and up on the balls of your feet, legs together. If you're going to do a modified push-up, then remain on your hands in knees. Either way, you need to make sure that your back is straight and you are horizontal to the ground.
- Lower your body
Bend your elbows and lower your body to the ground while keeping your back straight. Go as low as you can until your chest nearly touches the ground.
- Push up your body
While keeping your back straight, straighten out your elbows to push your body back up to your start position.
Repeat the steps for as many reps as you want. If you're building up to your goal of 100, then start small and work your way up to that amount. If you're going to do 100 all at once, then pace yourself and repeat the steps 100 times.