Elite athletes in extreme sports, such as freestyle snowboarders, demonstrate sophisticated control over their whole-body movements amid intense competitive pressure. The Snowboard Big Air competition necessitates precise management of riding speed, jump timing, and posture control during tricks. While the effects of cognitive pressure on physiological states and posture control are acknowledged, a previous study identified a positive correlation between precompetitive sympathetic predominance and subsequent jump performance in elite freestyle snowboarders, indicating their ability to convert cognitive pressure into successful jump execution. However, knowledge is limited regarding the influence of precompetitive physiological changes on overall body movement control and whether athletes possess this skill. We assessed the precompetitive physiological states, whole-body kinematics, and performance of 20 elite snowboarders in the Snowboard Big Air competition. Electrocardiograms and electroencephalograms were recorded for 3 minutes starting 10 minutes before each jump in three situations: practice, competition, and post-competition. Whole-body kinematics of a condition preparatory for takeoff were analyzed using computer vision techniques. Three professional judges scored each jump's performance based on international rules. The rankings were determined by the competition results. The results indicated a positive relationship of precompetitive mean heart rate and occipital theta power with competitive performance. Furthermore, precompetitive mean heart rate was positively associated with approach velocity just before takeoff. Our study suggests that high-performing athletes may exhibit a "cool" cognitive state but a "hot (fight)" physiological state in the body.