Gymnasts' movements are not standardized, and long-term incorrect posture will definitely cause harm to the body.
The stronger the muscle, the greater the impact on the joints that support the body (such as the knee joint), especially when doing long-distance running and walking for a long time, the wear on the knee joint is greater than that of people with light weight.
Because of strong muscles and fast metabolism, muscular men usually consume more energy than ordinary people. They are more prone to fatigue and hunger in their daily life. If they have more muscles and lower body fat, they will be afraid of cold and catch a cold.
Muscle will put a lot of pressure on the heart, which may lead to heart problems. Excessive intake of protein during exercise will also cause a great burden on organs. For example, long-term frequent excessive intake of protein may lead to the deterioration of renal function and increase the burden on the kidney. Because the metabolites of protein need to be excreted from the body through the kidney, if you take too much protein, it may increase the metabolic burden of the kidney, further worsen the renal function and cause symptoms such as kidney calculi.
As long as the training is moderate and the diet is correct, there is no harm to the body.