Caffeine is one of the most studied supplements out there. Piles of research demonstrate its safety and effectiveness. Research even demonstrates the health benefits of consuming caffeine.

But if you're on this site and taking caffeine, you're probably less interested in health benefits and more interested in performance benefits. I'm here to cover the four reasons why caffeine makes workouts better.

Reason 1: More Energy

Caffeine works in the brain as a central nervous system (CNS) stimulant, so when I say energy, I mean alertness. Caffeine blocks certain receptors in the brain that increase levels of epinephrine, adrenaline, and dopamine.

Caffeine works in the brain as a central nervous system (CNS) stimulant, so when I say energy, I mean alertness.

Blocking these receptors in the brain gives you that drive you feel—and a bit of euphoria—when you consume caffeine before a workout. This is how caffeine supplementation can make the difference between a great workout, and an OK workout.

Pre-Workout Powder Powerhouse Packed with 13 Hand-Picked Ingredients to Support Improved Workouts* A Cutting-Edge Pre-Workout Formula Built on Solid Science*

Reason 2: Increased Strength

The research on caffeine shows that one dose can increase muscle strength, assuming the dose is high enough.[1] Three hundred milligrams (or more) of caffeine—the equivalent of about three cups of coffee—delivered in a single dose stimulates the nervous system.

Increased energy

Here's where the increase in strength comes in: The nerves that activate muscle fibers, once stimulated by caffeine, activate those muscle fibers with greater force. More force equals more strength, which is why caffeine can increase your strength during a workout.

Reason 3: More Endurance

Caffeine increases endurance in several ways. The first is by increasing fat burning during workouts. When you train with caffeine, you burn more fat. This spares muscle glycogen, which means you have more energy later in the workout, when you need it most.[2]

Another way caffeine can improve endurance is by boosting nitric oxide levels. That's right, research shows that caffeine can enhance vasodilation, the term for the widening of blood vessels. This allows more blood to flow to the muscles, which in turn delivers more oxygen and more nutrients, resulting in greater overall endurance.

Caffeine increases endurance in several ways.

Reason 4: Less Muscle Soreness

Believe it or not, research shows that caffeine works great for helping ease muscle soreness by altering your perceived exertion during your workouts.[3]

With less muscle soreness, you can go harder, perhaps banging out a few extra reps you probably wouldn't have gotten if that muscle soreness was too much. More reps equals more work done by your muscles, and that equals better results.

Visit for more great fitness content, workouts, training tips, and articles on nutrition and supplementation.

Top Selling JYM Nutrition Products


  1. Beck, T. W., Housh, T. J., Schmidt, R. J., Johnson, G. O., Housh, D. J., Coburn, J. W., & Malek, M. H. (2006). The acute effects of a caffeine-containing supplement on strength, muscular endurance, and anaerobic capabilities. The Journal of Strength & Conditioning Research, 20(3), 506-510.
  2. Tarnopolsky, M. A., Atkinson, S. A., Macdougall, J. D., Sale, D. G., & Sutton, J. R. (1989). Physiological responses to caffeine during endurance running in habitual caffeine users. Medicine and Science in Sports and Exercise, 21(4), 418-424.
  3. Doherty, M., & Smith, P. M. (2005). Effects of caffeine ingestion on rating of perceived exertion during and after exercise: a meta‐analysis. Scandinavian Journal of Medicine & Science in Sports, 15(2), 69-78.

About the Author

Jim Stoppani, Ph.D.

Jim Stoppani, Ph.D.

Jim Stoppani holds a doctorate in exercise physiology from the University of Connecticut and has been the personal nutrition and health consultant to numerous celebrity clients, including...

View all articles by this author