This is clearly the most underestimated portion of the game. Golfers tend to ignore the cardiovascular component of golf. However, walkers cover an approximate walking distance of 6-7 klms each round. Even cart riders put in their fair share of walking depending on local cart rules, weather conditions and following errant shots. Poor cardiovascular conditioning can certainly have a negative impact on your game. According to Tiger Woods “fatigue can affect your focus and cause you to make a bad decision. I never want to lose a tournament because of a bad decision precipitated by my being out of shape. “

Source Susan Hill