SETUP: Superman Pull Ups, a.k.a. Prone Pull Ups, can be performed with bodyweight or with a towel, etc.
START: Lay flat on the ground and pin your shoulders back, pushing your chest out.
FINISH: Perform a shoulder press motion. The further your hands get from your body, the harder you’ll need to work to keep posture (possible weakness in your rear delts and/or lower traps). Pull your elbows down towards your sides and squeeze your lats hard.
TIP: To increase difficulty, lift your feet off the ground to introduce less stability and a static hamstring hold.