In briefThree men and four women, ages 19 to 60, were measured on a battery of laboratory tests before and after a four-week bicycle tour to determine the effects of long-distance bicycling on physical fitness. There was no significant body weight change, although the average total fat weight loss was 1.4 kg. Total skinfold measures showed a significant reduction, and the waist girth reduced 2%. Trunk flexion showed significant improvement, and trunk extension and ankle flexibility showed a slight reduction. Maximal oxygen intake increased significantly (11%). The greatest improvement was the mean bicycle ergometer riding time and resistance to higher work loads (17%).