The handstand pushup is the best bodyweight exercise to sculpt an impressive upper body—if you can do it, that is. It blasts your deltoids for broad shoulders and it hammers your triceps. Better still, it requires you to stabilize your entire body at the core for that six pack.
How to do it:
Get into a handstand with your feet on a wall for stability. Grab the ground with your fingers and lower yourself while keeping your elbows in front of your shoulders. Go as low as you can and push straight up.