What do muscles use for energy during exercise?

What do muscles use for energy during exercise?

John Spencer Ellis (Author, TV Show Host, Trainer and CEO, National Exercise & Sports Trainers Association) gives expert video advice on: What do muscles use for energy during exercise?; What should I eat before I compete in an athletic event?; Should I take extra vitamins and minerals? and more...

Your muscles use glycogen for energy during exercise, and the glycogen is stored in your liver and in your muscles. You only have so much that you can store. How much you can store depends on how fit you are. The more you train, the more you prepare, and specifically the more endurance activity and exercise that you do, the more opportunity your body gives yourself to store more and more glycogen in the muscle and the liver. That's how athletes get better, stronger, faster, and have more endurance; they're able to do so because their body has the ability to store more energy in the form of glycogen, again, in the muscle and in the liver.