 Fitness boot camps as outdoor fitness group classes developed independently in Australia in 1991 (Original Bootcamp), the United States in the 1990s, the United Kingdom in 1999 (British Military Fitness), and Canada in 2001 (The Original Boot Camp).Outdoor group fitness classes such as these have been growing in popularity ever since and have become a distinct commercial market within the fitness industry.In the United States, the television series Boot Camp aired in 2001.