Part of moving quickly in the mountains is maintaining energy levels. Forget to eat and you won't be going anywhere too fast for too long. In a race, this can be devastating but it can also suck on any long tour. Now, if you're the kind of skier that brings along some tasty turkey sandwiches, a big bag of trail mix and a couple of your favorite chocolate bars, well, you might as well stop reading right here. But if you've been experimenting with modern endurance fuels, carbohydrate gels and blocks, and you like what they do for you then read on.