It is difficult with the heat and the humidity. I did 70 miles this morning in 90+ heat and the Cytomax is absolutely necessary. We plan our breaks for stores where we can pick up cold water to mix with our powders (or some of the guys actually go for the soft drinks). I have also ordered some Enduralyte (Hammer product) since so many of the strong riders also mix it into their bottles with their energy drinks. I guess it really comes down to trial and error to see what works best for you.