Following them can lessen the chance of sports injuries. It must be allowed time to adjust its functioning. Vigorous activity uses up glycogen, a muscle fuel. Time is required for the body to produce more. Muscle cells also release potassium during sports.
Teenagers can become so dedicated that they overtrain and push themselves too much.
There is a limit to what even the best conditioned body can take. These include constant fatigue , persistent muscle or joint soreness, nervousness, depression , difficulty relaxing, headache , and loss of interest in training. With any vigorous activity, there may be some temporary muscle injury. As the muscle heals, it becomes shorter and tighter. This is a major cause of stiffness, soreness, and the tendency for pulls and strains.