The most common problem is that if you don't have enough fitness knowledge and don't ask a professional for guidance, then your fitness results are very different from others in posture. Because your training method may not look much different from others, but you may be under unbalanced pressure from the beginning, resulting in imbalance between the left and right muscles, or you may have problems such as round shoulders and high and low feet because of your wrong training method. These problems will be more difficult to correct after the muscles form memories.
Those who have received professional scientific training will avoid these problems early because of supervision, and gradually change your temperament from changing your posture.
Muscle strain in fitness is not uncommon, and many fitness veterans will inevitably get injured when they break through the bottleneck, not to mention novices don't pay attention to the correct training methods. However, the training of science majors usually has protective measures and protective gear, accompanied by professionals, which is much safer than blindly practicing according to your own ideas. Some people don't grasp their proper intensity, and the chances of being injured by trying hard will be much greater.
And fitness also pays attention to diet, not just eating and drinking after fitness today. Many people don't know the importance of food collocation. Without the guidance of professionals, they often get twice the result with half the effort, and it is difficult to see the effect of exercise.