PILLAR BRIDGE
Lie on your stomach, feet apart (farther apart is easier) and push up with your elbows, supporting your weight on your forearms (keep abs tight). Extend one arm for two seconds, then the other. Strengthens shoulders, abs, trunk.
ABOUT THE AUTHOR: Mark Verstegen is founder of Athletes' Performance and author of Core Performance Golf. He has worked with Phil Mickelson, Natalie Gulbis and other tour players and has consulted with instructor David Leadbetter.