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During an exercise session, vigorous cardiovascular workouts such as running or biking can typically torch more calories than resistance or strength training.
AKRON, Ohio -- The courageous lion has nothing on Ethan Puhalsky.
Nearly 1 in 20 Americans older than 50 have artificial knees, or more than 4 million people, according to the first national estimate showing how common these replacement joints have become in an aging population.