This annual study reports participation among Americans aged 16 and older in 21 human-powered activities, from backpacking to climbing, camping to kayaking and snowshoeing to telemark skiing. Both participant and enthusiast (most frequent participant) numbers and six-year trend data is included in this 200+ page report. Demographic data is reported including: age, gender, ethnicity, household income, marital status, regional breakdowns, and presence of children under the age of 18 living at home. The report includes cross-tab data for each activity, a youth section (16-24 years old), a section on female participation, and a look at adventure travel.