Dealing with the heat, at least initially, is always an issue. I think it is fair to say that most if not all endurance athletes have experienced some degree of cramps at one time or another, and most likely while racing or training on a hot humid day. Even those who live in hot climates need to acclimate somewhat to the hotter conditions of the mid-summer months of June, July and August, especially if you plan to race during that time.
When it is hot, especially when temps are in the 90-100F (36-40C) range, your body needs to work harder to keep your core temperatures in a safe range to allow the organs to function normally.
One of the ways your body keeps cool is by circulating blood to the skin. This allows the internal heat building inside to be transferred to the environment. Core temperatures of 104F (40C) have been observed with marathon athletes. So, transferring heat to the outside plays an important role in helping your core keep cool. Continue reading