Double-Rugged Ride and Tie
- A 20K trail bike and run team relay event. Held annually in October at Boulder Reservoir.
- http://www.5430sports.com/

Tennis to Go
- Tennis lessons by Ed Stein. Videos and photographs.
- http://www.tennistogo.net/

Boulder Rock Club
- Indoor rock climbing facility, exercise equipment, and free weights. Includes facility details and available instruction.
- http://www.totalclimbing.com/

Renaissance Adventures
- Summer camps, birthday parties, and after school programs in a live action theater role playing game for children ages 6 to 16.
- http://www.renaissanceadventures.com/

Mile High Skyride
- Offering bi-plane, waterbird, hot air balloon, and glider rides. Also offers skydiving instruction.
- http://www.milehighskyride.com/

International Mountain Bicycling Association (IMBA)
- Promotes mountain bicycling opportunities that are environmentally and socially responsible. Events calendar, membership details, and form are featured.
- http://www.imba.com/

Boulder Recreation
- Directory of parks and recreation, centers, special events, and traveling.
- http://bcn.boulder.co.us/recreation/

Boulder Cycling
- A portal of information pertaining to the local cycling community. Mailing list, free classified ads, articles, group rides and trail listings, reviews, and news.
- http://www.bouldercycling.com/

Women's Quest
- Adventure programs for women designed to strengthen the body and build confidence. For all ages and athletic abilities.
- http://www.womensquest.com

University of Colorado Fencing Club
- Events, officer listing, photo gallery, related links and contacts for this Boulder fencing club.
- http://www.colorado.edu/StudentGroups/FencingClub

Northern Colorado Fencers
- Information about the fencing club in Boulder, Colorado, established in 1979 by Gary Copeland.
- http://www.ncfencers.org/

Boulder Rugby Football Club
- Mens A, B, Senior and Schoolboy rugby teams. Schedules, standings and updates.
- http://www.boulderrugby.com/