Mel Robbins' "Stop Saying You’re Fine" focuses on overcoming mental barriers to achieving personal goals. Robbins argues that ingrained negative thought patterns and fear prevent individuals from taking action, illustrating this with various case studies. The book introduces the "five-second rule" and other strategies to counteract these internal obstacles. It emphasizes the importance of acknowledging and addressing true desires, seeking support from others, and developing a plan to achieve goals. Finally, the excerpt promotes a daily exercise regimen to boost motivation and build the stamina needed to overcome resistance.