“Training gives us an outlet for suppressed energies created by stress and thus tones the spirit just as exercise conditions the body.” ? Arnold Schwarzenegger

Doing exercise goes hand in hand with eating healthy. It’s one of the best ways that you can look good but more importantly feel good. If you ever feel stressed out and need to get away, then exercise releases all the tension and it also stimulates the mind. It’s no wonder why the fittest people are often the most confident.

The best forms of exercise for improving confidence and self-esteem are usually self defense trainnings such as Boxing and other martial arts. You’ll immediately see what difference it makes when you come

Boxing can build self esteem, keeps you fit and teaches you self defense.
Losing every fight would diminish your confidence, but training hard is done to prevent losing.
The good/bad mental qualities are not made in the gym, they already exist within the person.
It does boost mental/physical confidence and the feeling of it is really really great.