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"Running is my favorite cardio exercise, but if I don't change up how I run, my body will reach a plateau and I won't see any positive changes," says runner and personal trainer Loren Maine. "Aside from running 5 to 10 miles a week, I do sprints 1 to 2 days a week to challenge my body and help my training."
Originally published on FitnessMagazine.com, February 2012.