sympathetic activation, also known as the "fight or flight" response, is a rapid physiological response to perceived threats or stressors, preparing the body for action by increasing heart rate, breathing, and alertness, while diverting energy to essential functions. Sprints, high intensity 交感神经能使人兴奋、活跃、心跳加速、呼吸加快，以保证人体在紧张状态时的生理需要
parasympathetic activation: Slow (like parachute)， Diaphragmatic Breathing， Going for a walk 副交感神经系统可保持身体在安静状态下的生理平衡