First of all, it should be clear that no matter whether the posture of equipment fitness is right or wrong, long-term training will cause certain harm to the body. For example, just like people who work at their desks for a long time, no matter what measures are taken, cervical vertebrae, lumbar vertebrae and eyesight have problems.

Secondly, there is no clear boundary between right and wrong in sports. Let's give an example, such as bench press. The width of the grip is adjusted according to our own needs, and there is no uniform regulation for different parts of the pectoral muscle and the front and back position of the barbell. It depends on the position of your target muscle. There is another easy mistake in bench press, but we should also look at this problem in this way. In the usual training, this action is wrong. On the one hand, this will affect the training effect of the target muscle, on the other hand, it may cause unnecessary damage to the waist, but sometimes this kind of action will also happen when we carry out extreme training. In theory, breathing control during training should be based on a certain rhythm, but it is also allowed during extreme training.

Also, not every movement is suitable for everyone, and some may have an injury in a certain part, so there should be a replacement movement instead of giving the original injury.

So I think if you are a beginner, you can train according to the standard movements provided on the Internet or in books, which will help to avoid sports injuries. If you have a certain foundation and a certain understanding of equipment training, you should combine your own situation and have a set of equipment training movements that suit you.