Golf does have some impact on the body, but overall it's not something that will cause a body to break down. The most common physical ailment for golfers in back problems. A golf swing does place a lot of stress on the back over the years. But Tiger's body breaking down has ZERO to do with any of this. It's his knee. Abnd he saw this coming from the beginning of his career. Most people thought he was nuts to walk away from Butch and go through a swing change early in his career because he was so dominant. A big part of why he did it was because he knew his knee would not hold up if he continued to swing the way he was swinging.