I'm in Arizona, so a different kind of heat, but brutal nonetheless! I find that I must have electrolyte replacement before, during and after a hot run/walk otherwise I get headaches!! I am not a huge fan of sports drinks, but will drink them if that is all that is available to me! I prefer a tablet or powder to add to water, can make it as weak or strong as you need! Would like to hear from Chad on this, also, though!!