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Rut Buster: Spicing up your steady sweat sessions with speed will wake up your mojo, a study in the Journal of Sports Science found. Exercisers who did 50-minute runs rated their enjoyment as much higher when they mixed in six 3-minute intervals. Is it time to expand your routine repertoire? Check active.com for sporty events near you, or get free workout podcasts at motiontraxx.com/gseriesfit.