CrossFit btwb is for individuals and gyms alike. Your gym does not have to start utilizing CrossFit btwb before you can. Simply sign up here

If you don't belong to a CrossFit affiliate:

Join the "Main Site" gym, which follows the WODs posted on Main Site is a public gym; anyone can join it at any time. Feel free to follow the WODs or any of the free programming we offer from your Tracks page. You can also build and log results for your own workouts. 

If you go to a gym that doesn't use CrossFit btwb:

You can still join that gym on CrossFit btwb and compare results and interact with other people at your gym. CrossFit btwb contains a list of all affiliated CrossFit gym. Search for your gym during the sign-up process to join it. If you are not an affiliate, you can still create your gym and start planning your workouts. Encourage other gym members to join your gym on CrossFit btwb, too! 

If your affiliate owner decides he/she wants to take over the gym on CrossFit btwb, they can follow these steps to officially "claim" the gym.