Personally, it doesn't matter to have a coach, but at least experienced people should take the lead. If you practice blindly, you will be fine if you don't get hurt, whether it works or not. First, because of some important information, if no one guides you and fully understands it, you may be easily misled. Give a chestnut. Warm up before exercise. We generally have a wrong idea that warm-up can avoid injury during exercise. In fact, it didn't have this effect, and then a big coffee on the Internet came out to make rumors. You think, oh, it is unnecessary to warm up, and then you are too lazy to do it. But in fact? Warming up can relax some of your muscles. Maybe this part of the muscle is not what you need to exercise, but it plays an important leverage role. If it is nervous, you may not be able to do this action. Then people will not mention the role of your body activation. So it is necessary to warm up, but is it wrong to say that sports injuries are inevitable? That's right. It's just that your information is not comprehensive enough to mislead you. Second, the feeling of muscles is very important. Why do you say at least one person has to come in? Because in the beginning, you often can't even hold the barbell of bench press. Maybe you can do your other movements as standard as possible, but if you don't have this control over balance, it will be more difficult. But learning to adapt to balance is actually very easy. Answer the Lord, it only takes about a week, and you can practice three times. But I don't know why a friend of mine has been practicing for a month and hasn't started unprotected bench press, so the premise is that you practice really hard, even if it's empty. When you have this ability to master balance, other movements will naturally have experience.