Too much exercise can be harmful. Without proper rest, the chance of stroke or other circulation problems increases, and muscle tissue may develop slowly. Extremely intense, long-term cardiovascular exercise, as can be seen in athletes who train for multiple marathons, has been associated with scarring of the heart and heart rhythm abnormalities. People who take too much exercise feel extremely exhausted. They put too much pressure on their bodies. Their organs are overworked which may result in organ failures. Unaccustomed overexertion of muscles makes some damage. In extreme instances, over-exercising causes serious performance loss.
Chronic pain is one of the disadvantages which you may suffer a lot if you exercise too much. Although a normal amount of physical exercise helps to reduce the amount of general aches and pains that people experience, too much exercise routine can cause chronic pain. For example, runners can develop heel and knee problems from shock of running on pavement. Strength trainers who repeatedly do the same exercises with heavy weights can end up with straining joints and pulling muscles.