The CAPE (Cortisol, Affect and Perceived Exertion) Study seeks to determine, how exercise influences our emotional and hormonal responses to varying intensities of exercise. To date, the research investigating the psychological and physiological responses to exercise remains largely independent; associations between changes in mood and hormonal output have been seldom explored. The CAPE Study aims to characterize the relationship between the psychological experiences associated with different exercise intensities and subsequent physiological responses at various time points throughout thirty minutes of aerobic exercise on a treadmill and seventy minutes of recovery.