There are many benefits to exercise. Being physically active strengthens your bones, keeps your muscles toned, improves mood, and lowers your risk of heart disease. Exercising is generally healthy unless you are overdoing it (like working out more than once per day or never taking days off in between workouts). To make sure you have plenty of energy (and to prevent weight loss), you need to take in enough calories from food to fuel the exercise you are doing.
Most doctors agree that teens should exercise about 60 minutes on most days, but there are always exceptions to the rule. It’s always best to check with your primary care provider to see how much exercise is best for your body type. Remember, you burn calories when you exercise so you need to take in energy from healthy food to power your body, AND you need to drink water to keep your body hydrated!