Jack R.
Yelp
Great gym with friendly help and courteous respectful members. I've been a member for past two years. Feels like a little "gym community". Membership is mostly all adults with occasional teens, so no horseplay with kids running around as is the case at the Marin YMCA, which I've also been a member at over the years. I think it's a pretty good value for what you get, and the owner seems to replace/upgrade some equipment each year. Never overly crowded and can usually get through a workout at your own pace without having to wait for a machine or weight area to free up.
The outdoor "gym" is nice to have for a change of pace, too, especially when the weather is good (quite frequently in Marin!). There are a ton of classes to sign up for whatever you're into: Zumba, cycling, pilates, personal training, etc. and some are free with the membership. Good sauna, but it would be really great if the steam room was working, which it hasn't since I've been a member. Also refreshing that there are no "towel Nazis" monitoring the towel allocation when I head to the shower.
Nice to have a convenient parking lot to park in (although whoever owns it really really really needs to repave it and increase the lighting; it's pretty dark in the lot at night, and if I were a woman I'd be a little nervous walking to my car. Location-wise, it's very convenient with the added benefit you can go get a (light!) beer at Pond Farm after your workout!
All in all, I highly recommend Body Kinetics. I've only been to the San Rafael fitness center so can't comment on the other locations. BK is not Equinox or Bay Club, but it has all you really need at an affordable price.