Two large and important muscles necessary for a good golf swing are the hip flexors (the psoas major and iliacus). They are attached to the femur, the pelvis and the spine, so you can imagine the important role they play. Not only do they stabilize the lower back and allow for the proper biomechanics of the lumbar spine, but they also help a golfer relay energy generated from hip/trunk rotation into the arms and club. In short, they protect the lower back and help provide power in the swing.
"Tight and/or weak hip flexors can be a real problem," says Golf Digest fitness expert Ralph Simpson, a certified manual therapist who worked for several years in the PGA Tour's fitness trailer.
Stretching and strengthening these muscles are crucial and easy if you use three exercises suggested by Simpson. Click on the video below to see me demonstrate them.