First, tendon strain, the reason for this situation is insufficient warm-up preparation before fitness, and excessive exercise leads to shoulder pain.

Second, I overestimated my own strength. Many novices feel good about themselves. They should challenge difficult movements from the beginning, such as lifting barbells, step by step, and it is best not to try 60KG from the beginning.

The third reason is that fitness itself needs scientific method guidance, so don't avoid making cars. If conditions permit, it is best to go to the gym with the guidance of a professional coach. If the conditions are limited, you can install a fitness software on your mobile phone with detailed instructions.