Place both hands on the ground shoulder-width apart with your legs extended behind you and your feet together. You should be resting on the balls of your feet. Gently pull your ribs to your hips to engage your core. This is your starting position.
Keep your back flat and, on an inhale, bend your elbows and lower your torso toward the ground. Make sure that your elbows remain in close contact with the sides of your body.
Exhale and extend your arms, straightening your elbows, and lift your body back to the starting position.
This counts as one rep. Complete as many reps as you can with proper form in 20 seconds.