We highly recommend the use of Gatorade Endurance Formula for all of your long distance training and racing. This is the same drink mix found at most of the major running events and triathlons across the country including the ING New York Marathon, the Boston Marathon, the LaSalle Bank Chicago Marathon and all of the Ironman races in North America. Be prepared and train with what's on the course!We think Gatorade Endurance Formula is the best sports drink on the market and the 10 years science and research are there to back it up. We tested it for an entire year before we made the decision to carry this in our warehouse. We even had the opportunity to be tested at the Gatorade Sports Science Institute in Barrington, IL this summer to better understand our own personal hydration needs and how Gatorade Endurance Formula could help us in our training and racing. We can effectively speak from experience that this powder mix does the job and will make a difference.