Is caffeine good for the body if used with exercise?

No. Caffeine is a stimulate or a drug and for some people, taking in too much can work against your heart -- especially during exercise. It can make your heart race or cause you to feel palpitations. If you take in caffeine, do so in moderation. For example, 1 - 2 cups of coffee are within the limits of normal. Drink 2 - 3 energy drinks with high levels of caffeine before and during exercise may cause problems.