First: there are special coaches in the fitness room.
Under the guidance of professional fitness coaches, you can get twice the result with half the effort. A coach can use his professional knowledge to tell you how to exercise is the most efficient, he can help you customize your own fitness plan, and he can give you professional advice on fitness and nutritional supplement, which you can't do yourself, or you are not as good as a coach. After all, he is experienced.
Second: the fitness room has professional equipment.
The professional equipment in the fitness room can meet your needs of exercising all kinds of body muscles. Although there are actually many facilities around us that can be used to exercise, the equipment specially designed for human fitness is definitely better.
Third: There are many like-minded friends in the gym.
It's boring to exercise alone, and it's hard to stick to it. More is not the same. You can help each other and make progress together. Fitness is more efficient.
But going to the gym should also consider your time and financial ability, and you can't make a decision casually.