The document discusses different motivations for exercising, including intrinsic motivations like fun and enjoyment, extrinsic motivations like being paid or told to exercise, and motivations related to goals, values, health benefits, inspiration from others, achieving personal best times, feeling competent, relieving stress, and socializing with friends. It suggests that people are motivated to exercise by an internal drive to engage in goal-directed actions that satisfy that drive once the goal is reached.