“…For example the Borg's 15-point rating of perceived exertion (RPE) scale [34], the most commonly used psycho-physical measure for evaluating the subjective perception of whole-body exertion during exercise, yields a net index of several integrated physiological mechanisms, including cardiopulmonary variables, cerebral and peripheral metabolism, neural drive from motor cortex area, core and skin temperature and mechanical strain [35]. Thus, by altering the physiological processes which may subsequently be forwarded to consciousness via interoceptive pathways, exercise results in various embodied sensations such as sweating, cramping muscles, pounding heart, feeling "the buzz", "the pump", and pain, which shape affective experience of exercise [2,36]. Based on subjective interpretation of these sensations, even negative emotions such as pain may ultimately trigger positive feelings that promote future exercise engagement [2,36].…”