It's easy to understand the connection between aerobic fitness and self-confidence. When a person takes up an activity like running or biking, self-esteem gets a boost as goals for distance, speed, or endurance are met and surpassed.

Research shows that weight training also has a significant impact on self-esteem. Even a very modest regimen - working out with weights for 20 to 30 minutes, two or three days a week - can improve how we feel about our physical abilities and enhance our overall self-concept.