I don’t run in marathons or any other type of sport – but I work as a horseshoer (farrier). Not only am I next to (and under) hot horses all day long, but I shape steel horse shoes using a propane forge. During our hot, humid summer here in NJ (hottest July in the record books! 95* days with 65% humidity)….well, as you can imagine, I sweat. A lot. Your gel products have made a huge difference in how I feel during the day. I no longer get dizzy and lightheaded while working. Thanks for making a great product!