To perform a push-up correctly:

1. Start in a plank position with your hands placed slightly wider than shoulder-width apart and your feet together. Your body should be in a straight line from your head to your heels.

2. Engage your core and keep your body in a straight line as you lower your chest towards the ground.

3. Keep your elbows close to your body as you lower down.

4. Once your chest is close to, or touching, the ground, press through your hands to straighten your arms and return to the starting position.

5. Repeat the movement for the desired number of reps.

It’s important to keep good form during push-ups to get the most out of the exercise and avoid injury. Keep your core engaged, maintain a straight body line, and avoid letting your hips sag or rise too high. If you find the standard push-up too difficult, you can modify the exercise by performing it on your knees or with your hands on an elevated surface. As you get stronger, you can try more challenging variations, such as narrow grip push-ups or plyometric push-ups.