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128 Posts
If you don't mind my asking, how old are you? I looked at your Garmin page, and noticed your heart-rate was in the 160-180 range much of the ride. Unless you're in your teens or early 20's, that's pretty high. You might want to ease off a bit and try somewhat lower gears. You might also want to check out one of a number of books on using HR data for training purposes.