(1) Gradual lack of motivation to work out
Because of central nervous fatigue, you will gradually lose your motivation to work out, and even want to give up working out altogether.
(2) Unusual Soreness After Strenuous Exercise
Soreness after exercise is normal, but unusually strong and persistent soreness that can't be relieved should get your attention, because that's probably a sign of over-exercise.
(3) Decrease in muscle mass and increase in body fat
Prolonged over-exercise causes the body to secrete a catabolic hormone, cortisol. This hormone leads to muscle breakdown, and fat gain. It is worth noting that people who are chronically anxious and irritable are also prone to secreting this hormone.
(4) Restlessness and Difficulty Concentrating
Difficulty in calming down and falling asleep for a period of time after training is most likely caused by over-exercise. If you can't rest and calm down, you won't be able to recover well.
(5) Feeling tired all day long
Prolonged and strenuous exercise can lead to the secretion of cortisol, and a drop in androgens, which can cause a person to lose energy.
(6) Sore joints and limb muscles
Delayed muscle soreness after exercise is normal, but once this phenomenon persists or gets worse, you need to revisit your exercise regimen.
(7) After exercise, but more likely to get sick
Long-term high-intensity, prolonged training, will reduce the immune system, so that people are more prone to disease, violating the original purpose of obtaining health through fitness.
Extended information
Exercise is an important means of improving health and longevity. However, the amount of exercise is not the greater the better, too much exercise can make the body's immune function is impaired, affecting health.
This is because people in the strenuous exercise, the body will produce more adrenaline and cortisol and other hormones, when these hormones increase to a certain number, can make the immune organs in the spleen to produce white blood cells in the ability to greatly reduce the lymphocytes in the A-cells, B-cells, as well as the natural killer cells (NK cells) activity is greatly reduced, which can be reduced by 35% of the natural killer cells.
Source: Baidu Encyclopedia - Exercise Overdose