Billions of people all over the world drink coffee as a stimulant. Even athletes have been using caffeine to enhance sports performance for years.
Caffeine has been reported to spare muscle glycogen (stored fuel) by increasing fat oxidation. It can also enhance endurance performance by delaying fatigue.
The stimulatory effect of coffee for sports depends on the type of coffee, the amount you drink, when you drink it, and the person who is drinking it.