You can let yourself go to the gym with him. You can say you want to exercise, or you want to lose weight healthily. Let him go with you, so that he won't refuse you. He will go to the gym with you. If you go to the gym with him, he won't feel healthy and bored, and he won't feel that you are rejecting him. He will enjoy the process of fitness with you, and he will feel very happy running with you.

If your boyfriend refuses this behavior, you can say that one person will get a 10% discount on the fitness card, but if two people do it together, they may get a 60% discount, which can save a lot of money. You can ask him to go to the gym with you in this way, and take him with you every time you want to go to the gym. If he doesn't want to go, you can tell him that the money for the fitness card is wasted. Or you can ask him to accompany you to the gym in a coquettish way.

You can also talk more about the benefits of fitness at ordinary times. You can tell him that you want to have a healthy body with him and don't want you to worry about each other because of some diseases. Or you can tell him that you like a star's abdominal muscles and want him to give you fitness. You must encourage him when he goes to the gym. Sometimes love is more powerful than anything. When you encourage him, he will have great motivation, and he will always insist that fitness is a sport.

Or give him some praise after his exercise, which is his recognition. When he hears how the woman he likes praises him, he will certainly be very happy, and he will also turn this mood into the motivation for exercise. He will feel that fitness should be done better.