Hehe, the reason why the angle and light are different. If you carefully look at the angular muscle lines in the mirror, they are basically dark, because the intensity of light entering the eyes is different at this moment, so obvious lines will be produced.

When you look at it yourself, it's usually in front of you, and you can't see it clearly. This is also a mirror. The same movement angle is the same. The intensity and direction of light are different, and the effect is different. Bodybuilders wear body-building oil during the competition, which is a good light-absorbing substance, just to eliminate this contrast, which shows that you still need to strengthen your exercise. Come on, I wish you a perfect body as soon as possible.