Intimidated by buff personal trainers and fitness-video hosts? Perhaps cartoon characters can add pep to your workout. Fit by Fun animates your exercise with illustrated trainers, upbeat music and a community feel, giving you a list of "classmates" currently using the site. The fickle can adjust their workout scenery and sound track. Though many of its classes and services, like progress tracking, require a paid membership, some are free.
The classics: WebMD, Livestrong.com, Discovery Health, Health.com, About Exercise