The prerequisite may be that if you can exercise and have self-control, you don't have to go to the gym. When we go to the gym, we are often led by the teacher. A person who can keep fit and doesn't need the help of a teacher can naturally go to the gym without spending that money. Most of us go to the gym because we don't think we can keep exercising at home.
There is also a premise that there are so many fitness equipment now, many of which are suitable for home use. Don't go to the gym after buying one or several home fitness equipment. After all, a fitness equipment looks like thousands, and if you want to go to the gym, then this equipment will lose its value, so we should force ourselves to exercise at home, which is both economical and convenient.
In a word, fitness is one of the most popular lifestyles in modern times. Without these conditions, we can still go to the gym.