We need calorie replenishment to participate in sports activities over an hour. Many sports drinks are hard to digest and cause stomach pains. It is hard to get the calories needed for activities over 2 hours. There is a new product called Maurten that provides a new breakthrough in this area. It is out of Sweden and just became available in the US. It has been quietly being used by the winners of most of the major marathons over the last year as well as Nike's 2 hr marathon effort. The article in SI below provides an overview. In simple terms, they encapsulate the calories in minuscule gel-like bb's that pass through your stomach without irritating it. This way you can take in more calories to fuel your performance. They offer packets of 160 calories and 320. The 160 is good for 1-2 hour outings and the 320 is better for longer activities. I know a tour de France cycling team that used it this summer and had several stage wins and they attribute some of their advantage to their riders using Maurten. I have used on several three hour rides and I feel noticeably better in the last hours. For those of you who participate in long runs, rides other cardio activity, this is worth checking out. Below is also a link to where you can buy Maurten online.