Participation in sport or fitness activities in Great Britain was examined through a survey of more than 6,000 adults throughout Great Britain. As of April 2001, 35% of adults surveyed were currently participating in sport or fitness activities. Those most likely to participate in sport or fitness activities were male, young, in high social classes, and employed full-time. The most popular activities were swimming, walking, and keeping fit/yoga. The most common venues for participation were leisure centers, home, and sports clubs. The most common motivations for participation were to keep healthy, for enjoyment, and to get fit; only 5% of respondents cited wanting to learn new things. One in seven respondents participated in their chosen sport or fitness activity daily, and two-thirds participated at least once weekly. Four in 10 respondents believed that their skill and performance was improving, and 5 felt that it was staying the same. Forty-four percent of respondents regularly followed sport as a spectator. The following items are appended: technical information on the survey; notes on the tables; definitions of socioeconomic class and regions used in the survey; the an analysis of weighted and unweighted samples; and the questionnaire. (Contains 24 tables and 10 references.) (MN)