SETUP: Grab a bench for your hands and a bench for your feet (or improvise and use an upturned heavy dumbbell for your feet). Your hands should either be pointed forward over the edge of the bench (like mine in the video), or turned out slightly.
REP: Lower yourself to a 90 degree angle, keeping your elbows as tight to your sides as you can and staying close to the bench, then drive yourself back up by squeezing your triceps hard.
TIP: There’s no need to drop below a 90 degree angle on this exercise. I see people doing it regularly, and all it does is strain the front deltoids.