Instructions:

1. Start in a push-up position with your hands shoulder-width apart and your feet together.
2. Bend your elbows and lower your body towards the ground, keeping your back straight.
3. As you lower your body, lift your feet off the ground and bring your knees towards your chest.
4. Hold this position for a few seconds, then extend your legs back out and push yourself back up to the starting position.
5. Repeat for the desired number of repetitions.