We all have them: friends who love all things exercise, routinely adopting the latest fitness program, posting their exercise regimens on Facebook and inadvertently making the rest of us feel guilty for watching another episode of Orange is the New Black on Netflix. Their enthusiasm is infectious, especially at this time of the year when many of us – due to New Year’s resolutions or a bit too much pie and general merriment during the holidays – feel compelled to get off the couch and exercise.

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