If you have been sitting 10 minutes or more between shots, stretch out your shoulders. Nothing elaborate here--put your right hand 4 inches above your right shoulder, with your elbow facing away from you. Push your left elbow back gently but steadily to keep your upper arm and shoulder loose. Do the same thing with your left arm.
The twisting of the upper body is the best way to simulate your swing. The golfer gets power by rotating backward and then forward to drive the ball. Twist your upper body at swing speed to the right and then back again to the left. Do this five times, and you should be ready to swing again.
Before restarting your round, walk up to the nearest tree, extend your arms and set your left foot back 18 inches behind your right. Raise up on your left calf five times and do the same thing with the right leg. This will keep you from pulling a muscle when you add that extra power to your swing.