In the molecule, the energy is stored a Glycogen in the muscles or as fat beneath the skin. Glycogen is a polysaccharide molecule of Glucose. The main function of Glycogen in the human body is to act as a long-term reserve for the energy.
There are other forms such as triglyceride stores that are stored in the adipose tissue. These are also referred to as fats. Glycogen is primarily made in the liver and it stored in the muscles. The liver of a human being that weighs 70 kg can store around 100 to 130 grams of Glycogen at a time.