Lack of heat loss via ____________ while training in a hot and humid environment presents the greatest risk for heat-related illnesses.

The lack of heat loss via evaporation while training in a hot and humid environment presents the greatest risk for heat-related illnesses.

When the humidity levels are high, the air is already saturated with moisture, which hampers the body's ability to evaporate sweat. Evaporation is a crucial physiological process for thermoregulation; it cools the body as sweat evaporates from the skin. In a humid environment, when this process is impaired, athletes and individuals engaged in physical activities are at an increased risk for heat-related illnesses such as heat exhaustion and heat stroke. It's essential for those training in such conditions to stay hydrated, monitor their exertion levels, and take breaks to help manage body temperature effectively.