This is another common topic in exercise, any kind. Dancing, martial arts, sports, weight lifting, calisthenics, running, cycling, all of it. If you exercise in some way, it will boost your self confidence by a ton.
I've seen exercise transform people. It really does wonders. Sometimes to them, it's all they've got. But that's okay, if all you have is making yourself stronger and better mentally and physically, that's fine because those are two things that help us become who we are.
I'll give you an example. You have a young boy, with great potential that he hasn't figured out about just yet. He starts out in, say, middle school. Just got through fifth grade, that time when we're all changing, getting acne, gaining weight, feeling insecure, and most are dealing with depression which will last until high school or the rest of their lives. It's all a common part of life we deal with.
So this young boy, looks around his school and decides he wants to be difference. He doesn't want to gain weight, or be uncomfortable with himself and decides that acne is just a part of life that he'll deal with. He'll make the best of himself.
He starts to exercise, he rides his bike, runs, does as many push ups and pulls ups and squats and jumping jacks and things of the like that he can do all at once over the course of an hour each day. He starts to get some muscle, become a little stronger, in fact a lot stronger than he used to be. So he starts to feel better about himself, because he doesn't have anything to be self conscious about and he notices as well.
He notices also that he feels better than he used to. He can perform daily tasks with no issues and has an easier time keeping up with the world around him.
So what do we notice in this example? That this boy has made himself stronger, and he feels better. He made his body stronger, and that made his mind stronger.
When you exercise, you feel better, and you start to look better, and when you start to look really good, you feel even better because people notice you even more and usually have less negative things to point out because they can't find any in your appearance. If your personality has something to do with people not liking you, then I can't help you there.
Now I'm not saying, people will say negative things about you if you're out of shape. But, they will have an easier time pointing these things out. That is why people feel more self conscious when they're not in such great shape and that's why they don't feel as good as they can feel good.
By becoming stronger, you boost your mental strength with confidence, insults aren't as easily taken in, you're less of a jerk yourself because you feel better and you're not laughing at other people because they're out of shape, you could have been too.
Now for those of us who have been in shape pretty much all of our lives, we're usually a nicer bunch, on occasion you will run into somebody who's naturally thin that's a complete butt head, but I'm not here to talk about personality issues.
With exercise, your confidence level becomes higher. If you know that you look good, you'll know that you feel good. Exercise also relieves stress, and stress can sometimes be a problem in self confidence, exercise helps with getting rid of that though.
If you do something physically, and you know you're at least somewhat good at it, you'll feel better about yourself. For instance, I used to ride my bike about thirty to forty miles a day five times a week. I usually would do a good two hundred miles a week on my bicycle, at least, and then count in the unicycle and it would be even more.
I knew I was good at riding my bike, and I was fast, and I had incredible endurance. (still do) I always felt good about myself because I always had something resting in the back of my mind that said I was good at something. Each of us are the same way, if we know we're good at something that makes us feel better, we'll always feel good. Confidence is always at an all time high, when, you are exercising.