The 75 Hard Challenge is an excellent way to build confidence by pushing participants to achieve goals through discipline and consistency. The program's structure requires participants to commit fully to a challenging routine, which includes two workouts, a strict diet, and daily personal development. By consistently meeting these goals, participants can develop a strong sense of self-efficacy and confidence in their ability to overcome obstacles. The mental toughness aspect of the challenge helps build resilience, which further enhances confidence. As participants progress through the challenge, they can see tangible results in both their physical and mental well-being, which reinforces their confidence in their abilities.