This article examines the interaction between physiological arousal, negative emotions, and the athlete's performance. It describes how heart rate, physiological arousal, emotions, the sympathetic nervous system, and performance are interconnected and explains how warm-ups prepare athletes for optimal training and competition. The article also provides coaches with strategies that can guide an athlete toward an appropriate level of physiological arousal for a successful performance and explains how to implement a growth mindset into day-to-day coaching so athletes have a positive attitude toward their training and can better manage situations that trigger negative emotions.