I have tried Crunch, World Gym, Club One, Fitness SF, and the Embarcadero YMCA and I would have to say that World Gym is the most serious gym here in the city.

I have tried Crunch, World Gym, Club One, Fitness SF, and the Embarcadero YMCA and I would have to say that World Gym is the most serious gym here in the city. They have 3 really nice squat cages (shown here: http://s3-media4.ak.yelpcdn.com/bphoto/ZsbwBday0IKkB1SljAUbQA/l.jpg http://s3-media4.ak.yelpcdn.com/bphoto/ZsbwBday0IKkB1SljAUbQ...), tons of bumper plates, a huge assortment of freeweights, and a ton of different machines. Oh and they have a bucket of chalk next to the cages, so that's definitely encouraged there. If you're looking for a gym to just lift heavy shit, this is the place. Yeah, there are some typical gym bros here, but I've never had an problems and everyone is pretty good at following proper gym etiquette.