Golf is atype of game, but also its a sport. 'a game is a physical or mental activity with rules played for entretaiment'.
The fact that there are golfers with different body types, habits or age, is often used as evidence that they are not athletes. But,the golf swing definately involves physical exertion. This required skills, abilities and a technique as well as psychological focus. In all sports there are categories in which the performance is higher or lower. Golf ranges from amateur to professional or elite category.