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"The most traditional forms of fitness are all free - jogging, push-ups, hiking, rope jumping, sit-ups, stretching, dips, lunges. Today we've enlisted David Leonhardt, who writes about fitness and nutrition at http://thehappyguy.com/category/fitness/ , to share with us three very basic and very traditional ways to build muscle on the cheap - and to power it up a notch or two without spending more."