Self-efficacy significantly impacts adherence to fitness routines by influencing an individual's belief in their ability to succeed. Those with high self-efficacy are more likely to set ambitious goals, remain committed, and overcome challenges. Conversely, low self-efficacy can lead to feelings of doubt, discouragement, and inconsistency in workouts. Building self-efficacy can be achieved through small victories, positive reinforcement, and social support. As individuals gain confidence in their capabilities, they become more inclined to stick to their fitness plans, ultimately enhancing their health outcomes and overall fitness journey.