Aerobics and Fitness Association of America (AFAA)
   Includes an online trainer certification course, as well an online textbook.
   http://www.afaa.com

Alexey's Stepcenter
   Provides animated choreography videos, a step language dictionary, a music board, links, and message board.
   http://www.stepcenter.com/

Cardio Strippersize
   A dance-based class that combines stripper-like moves with a cardio workout.
   http://cardiostrippersize.com

DanceNet Fitness
   Dance as an alternative to mainstream fitness. Instructor and Studio listings by state.
   http://www.dancenetfitness.com

Easy Exercises
   An online programme of exercises to be incorporated into your everyday life.
   http://www.easyexercises.com

FitMoves
   For professionals and enthusiasts. Articles, choreography exchanges, videos, spinning database, sample programs, personal training tips.
   http://www.fitmoves.com/

Fitness Harmony
   Provides tips, news, and videos. Also includes a member's only area.
   http://www.FitnessHarmony.com

GetUpMove
   Uses the video game "Dance Dance Revolution" to exercise. Testimonials, introductory guide, forums.
   http://www.getupmove.com/

Jacki's Aerobic Programs
   Jacki Sorensen's dancing, workout and strong step classes includes the US and Australia. Class locator, gear, videos.
   http://www.jackis.com

Jumpybumpy
   Instructor portal offering aerobics and step choreography, videos and music, conventions and workshops, trainer listing.
   http://www.jumpybumpy.com

Mad Dogg Athletics and Spinning
   Education, apparel, forums, advice and accessories. Venice, California.
   http://www.spinning.com

Mr. Move it
   Fitness trainer and creative artist of movement. English and German.
   http://www.mrmoveit.org

Stride Walkfit
   Brisk arm movement with the use of poles in conjunction with walking, also a series of stretching and toning exercises.
   http://stride.gabel.net/

Turnstep
   Large repository of aerobics choreography and patterns plus video reviews and an active discussion forum.
   http://www.turnstep.com

Vita's Vibe
   AFAA instructor and examiner's site includes forum, routines, news, tips, and guidance.
   http://www.vitasvibe.com