It's because their swing foundation is supported by muscles and tendons that are fit. You bet they do. The time you spend strengthening your GSMG is directly related to the quality of your repetitive tempo. We all know that. The trick is to optimize the quality of your practice time.
Perfect practice makes perfect.
By strengthening your GSMG, you will optimize the time you spend off course, and reduce your numbers on the course. The right length, the right weight, the right grip. As the name implies, it is virtually impossible to make a bad swing with SwingRite. For best results take 15 practice swings a day, and SwingRite will do the rest. Gradually your golf muscle group will strengthen and improve in tone while the proper muscle memory is being ingrained.