It's a great site for beginners and intermediate exercisers, with top names and solid programs, but those looking for bigger physical challenges might be disappointed. Moreover, as these videos are tied to Gaiam's DVD releases, the workout library isn't updated as frequently as some other sites.
GaiamTV offers a 10-day trial.
BeFitin90 YouTube channel
Cost: Free. www.youtube.com/user/BeFitin90
If you have a big appetite for fitness but a small budget for it, YouTube is a great place to find instruction.
One of the best channels for those looking for circuit training is Lionsgate's BeFitin90, which offers a 90-day program of strength, cardio, yoga and athletic drill workouts. The plan serves up five days of workouts a week, each totaling 35 minutes, as well as health and nutrition tips on the off-days.
The workouts here, hosted by former British track-and-field Olympian Samantha Clayton and personal trainer Garret Amarine, are challenging, building in difficulty as you progress.