I would recommend staying as far away from Fitness SF as possible. I bought a Groupon deal to try this gym out for a month. After I bought the month they told me that I would have to pay first and last month to sign up, so I ended up having to pay for three months to use the one month groupon deal. In the end I decided it wasn't the gym for me and I went in and cancelled the membership. Even though they told me it was cancelled they continued to bill me. I called to find out what was going on and they claimed I never cancelled and wanted to charge me $165 to close the account. I told them I had closed the account and would not pay for extra months that I had not used the gym. They sent the bill to a collection agency and it dinged my credit score.
Worst experience I have ever had with a gym. I bought a groupon to try this gym out, and ended up being scammed out of hundreds of dollars, and had a bill that I didn't owe sent to collections.
Awful awful awful, please do not go here!