Adam Savage Shooting Advice - You want to be the reed that bends

Adam Savage's One Day Builds: Machinist Tool Drawers!

See 37:38 to 38:04 of the video. The link should jump there.

And he's spot on in all of my hobbies. 

Bowling...you have to have a completely relaxed approach, swing, and grip. No muscles. 

Distance running...you have to keep your upper body relaxed and "quiet."

Probably true of most endeavors that require precision and efficiency.