I once had such an experience. Once I stretched my arm in the gym and put the water cup I carried with me one or two meters in front. Because I want to drink water, I got up and ran to get a glass of water. As a result, I didn't expect the boy who was diagonally opposite me to come over and want to take my fitness equipment.
Before I could say anything, he had already started exercising, and obviously his eyes didn't look at me. This happened, which immediately affected my mood, but it was not good for a girl to have a direct conflict with him when she was outside exercising, so she chose to do other sports, but I didn't want to let him go like this. Remember to satirize him when you leave: people are quite tall and things are quite short.
There are also some people who like to occupy fitness equipment in the gym. Every gym seems to have one or two very popular sports. In my impression, no matter how many people turn around in front of it, a boy doesn't care about exercising slowly on it, and sometimes even wastes time on his mobile phone. It is impolite for such a person to maliciously occupy fitness equipment.
If you encounter this kind of malicious seizure or occupation of fitness equipment in the gym, you can directly tell him that you have been here for a long time at a volume that everyone next to you can hear. This is mine. I haven't finished exercising yet. You always feel guilty when you do something wrong.