Teaches:
shooting kinethestics, flinch control.

Requires:
a partner and a backstop that will stop your fire even if you significantly miss your target.

Drill:
Most of the flinch comes from anticipating the noise and flash of shooting, not the recoil itself. Anyone who has hammered a nail has handled more recoil in their hand than a handgun usually imparts. Shooting blind, with heavy hearing protection, can help show a shooter that the recoil is not difficult, as well focusing attention on the internal feeling of stance and shooting. This aids in visualization and kinesthetic awareness.

You can cut down on noise by using ear plugs in tandem with muffs. Line up the gun on target, and close your eyes before taking the shot.

Important: your partner is there to watch your muzzle. She should keep a hand on your shoulder as long as you are pointed safely. If any unsafe range condition arises, she should take the hand off your shoulder.

Variations:
Learn to tell when your slide locks back by the feel of the recoil alone. Your partner loads a magazine with an unknown number of rounds, and after each shot, you report whether you think the gun is empty or not. Believe it or not, you will be able to tell pretty quickly. You can also do a blind emergency reload when you feel the last round go. Your partner will need to keep a close eye on you for safety.

Caveats:
Besides the obvious safety considerations, you should probably only do this infrequently. In general, you want to train yourself to shoot with your eyes open.