Skiing, hiking, riding a bike, and surfing are fun, but the exercise is incidental to the fun. Fun is great, but it's an inefficient way to get fit.

滑雪、徒步旅行、骑自行车和冲浪很有趣，但锻炼只是乐趣的附带品。

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And the fact that the lack of effort involved means you have to wrap up warm - or get very cold - serves as a reminder as to how much less exercise riding an electric bike involves.

BBC: Electric bikes: For people who don't cycle?

Though staging a new race is a huge challenge, Tamarro is an experienced organizer of 10Ks, so he knew how to calibrate the mileage, a tedious exercise that requires riding a bike and counting notches on a clicker.

CNN: Forget Boston: Runners find alternatives to big race