Start sitting on a weight bench. Move your booty in front of the bench with your legs out in front of you, with your fingertips facing your back.
Straighten your arms, and keep a little bend in your elbows in order to always keep tension on your triceps and off your elbow joints.
Slowly bend at your elbows, and lower your upper body toward the floor until your arms are at about a 90-degree angle, keeping your back close to the bench.
Slowly press off with your hands, pushing yourself straight back up to the starting position for one rep.
If this is too difficult, do this exercise with your knees bent.
Continue for a total of 40 seconds, then rest for 20 seconds.