Caffeine is widely known to stimulate the body and mind. During physical activities, caffeine can increase the rate of blood pressure, the pulse rate and stomach acid production.
In endurance sports, caffeine helps to mobilize fat stores and encourages working muscles to utilize the fat as fuel, thus sparing glycogen. The glycogen then can be used during later stages of the exercise.
Caffeine allows the body to improve its overall performance during physical activities by increasing its alertness, focus and your body’s fat burning ability. It also decreases the muscle pain hence helping you get more of your work out. Read more about caffiene here.