WHY IT HAPPENS: Since a lot of the power of the golf swing is generated from a tightly-coiled upper body, four out of five golfers will suffer from pain in the lower back at some point.
HOW TO PREVENT IT:
Stability ball back extension.
Place your stomach on a stability ball (try the Pro Fitness Gym Ball, around £3.99, from argos.co.uk), toes on the floor slightly more than shoulder width apart.
Place your hands behind your buttocks. In a slow, controlled manner, raise your upper body until you create a slight arch in your back, then return to the starting position. Perform two sets of 10 repetitions.