However, high temperatures challenge your body's ability to keep cool during exercise. Convection cools your body when air moves across the surface of your skin and carries heat away with it. You feel this process working when you stick your hand out the window of a moving car or stand directly in front of a fan.
Radiation is the release of heat as an unseen wave of energy.
You've likely felt the effect of radiation before when standing on a black asphalt parking lot on a hot summer's day. You can feel the sun's heat being reflected up toward you. In a similar manner, your body radiates or releases heat to the surrounding environment. Evaporation is the primary avenue to control your body temperature when exercising in a warm or hot environment. Your skin is cooled when sweat evaporates from it.