Self-discipline significantly affects fitness success as it drives consistency and adherence to a structured workout and nutrition plan. Individuals with high self-discipline are more likely to push through challenges, remain committed to their goals, and resist temptations that may hinder their progress. This trait fosters a routine that includes regular exercise, balanced eating, and recovery practices. Building self-discipline can be crucial in overcoming setbacks and fostering a long-term commitment to a healthier lifestyle, ultimately facilitating better health outcomes.