MuscleMag International or Musclemag is an American bodybuilding, fitness and men's magazine, considered one of the top bodybuilding magazines. It was established in Canada in 1974 by Robert Kennedy, an immigrant to Canada and leading expert in fitness and bodybuilding, with an initial print run of 110,000. It divides its magazine and website into Muscle Building, Nutrition and Supplements, Strength Training, Culture and Girls, regularly featuring fitness and glamor models and sex tips.
Kennedy died in 2012, and his company filed for bankruptcy the next year. MuscleMag was acquired by Active Interest Media.