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The Sport Tool alpine trainer ($180) keeps track of everything except how much wine you downed at lunch. This tidy GPS unit straps to your arm and records up to 50 runs, tracking vertical feet, distance, and maximum, current and average speeds. It also serves as an altimeter and timer. It’s easy to program, and the large screen makes for clear viewing at cruising speeds. The bad: The armband needs to be lengthened to fit over winter jackets and the battery cover is a pain. Still, it should satisfy your inner nerd. navmanusa.com