Blind pursuit of fitness is not suitable, and neither is the gym.
The principle of gradual progress, reasonable arrangement of time and balanced nutrition.
You can start with simple short-term sports, such as running, skipping and badminton, which are not very intense. Choose the sports that suit you according to your own situation and stick to it for several cycles.
Exercise needs long-term persistence. Good exercise helps to improve immunity, increase mental outlook, make the body full of vitality and contribute to life and work.
If a person can't persist, he can find friends to supervise and exercise together, which also avoids a lot of trouble and embarrassment and increases a lot of fun.
I hope I can help you.