You won't look too ugly when you exercise. Generally speaking, you will gnash your teeth and scowl because you have to exert yourself. A little ugly, but not too ugly. Don't care too much about the eyes of the outside world. In fact, you think that your expression is too ferocious when you exercise, but in fact, in the eyes of others, you are trying, especially a behavior of men, which is particularly attractive, rather than feeling that your expression is too ugly to affect your image.
If you are not a star, no one will think you are too ferocious when you exercise and express any opinions. And stars don't exercise in public, they all have their own private fitness places, so there is no such worry.
And I think your understanding of image is wrong, because expression affects image, and this understanding is wrong. Image is not determined by your expression, but by what you do. Walking in the street, spitting, littering, or running a red light, or walking unsteadily are all important factors that damage your image. Proper speech and dress are important factors that affect the image. Instead of paying attention to whether your expression will damage your image during exercise, it is better to read more books, pay more attention to your clothes, speak more carefully and better establish your image.
If you must have an elegant way to exercise, I can recommend you to do yoga. Yoga is very elegant, not only with beautiful posture, but also with great exercise effect, especially stretching effect. Can increase the flexibility and flexibility of your body. Other sports, as long as they reach intensity, will not be beautiful. Even if you run, you will sweat if you run too much. Let me see, only yoga can meet your elegance, and only that kind of low-intensity yoga.