Let's get physical, physical! SpecialExercises is technically a fetish site, although it has one of the more unique spins on rigid discipline than your average whips and chains page.
The slaves on this site are forced to do grueling exercises and workout routines until they're about to pass out. The generally female instructors guide their babes through a series of punishing exercise workouts, usually while the chicks are nude. I didn't know that jazzercise qualified as a fetish, but it's still hot content.
The content is as straightforward as that. Since this is (supposedly) a BDSM site, there's no intercourse involved - just bottom-y babes getting naked and getting fit. As I mentioned, I don't know if this qualifies as BDSM - I could be narrow minded, but other than getting verbally ordered around the action isn't any rougher than a YMCA workout. Still, there's something very sexy about watching naked babes work it for a harsh instructor and I'll take these workout sessions over Tae Bo any day.
Currently there are 37 episodes available with new material coming in at the end of every week. Every episode comes with their own pics and vids as you would expect. The pics really don't do the action justice - since a lot of the kink comes from the verbal abuse it's pretty hard to capture that with mute photos. These are still high res pics however and they ought to give you a good idea of what to expect in the vids. The 37 movies can all be downloaded and watched with good-looking WMV files. This is where the action is. Every episode has a harsh taskmaster who really puts her pupils through the ropes. She gives them a verbal tongue lashing and the babes struggle to keep up with her demands.
It's a fairly slim amount of content, despite the update schedule. There are no bonuses either so subscribers better be satisfied with what they see.
This is a fairly narrow niche and this site does a good job tackling it - hopefully new content will be coming down the line soon.