Every evening after finishing my yoga session, I leave the yoga studio feeling strong, calm, revitalized, and, above all, incredibly sweaty. The combined effects of a heated yoga studio and physical exertion always seem to challenge my body temperature, resulting in the feeling that every square inch of my skin is oozing with perspiration. My yoga teachers have always told me that sweating is very healthy, and it helps the body get rid of toxins and excess energy. In looking into this question of why we sweat, I will examine the biological basis for sweating, and why it varies from person to person.