In the fitness world, they say building your body is 20% what you do and 80% what you eat. In a sport like golf, what you fuel your body with on the course is extremely important as you trek around 18 holes (or more) in a single day.

The average round of golf takes about four hours to complete, and during that four hours your body is burning somewhere between 1070 and 1,650 calories per round — contingent on whether you’re walking or riding a cart, carrying your clubs or pulling them, and other factors.

And four hours is a long time to be physically active, so those mid-round snacks really matter — especially to Tour pros who need to stay on top of their game at all times.