To sign up, click "GET FREEBIE", and scroll through the list of participating gyms to find one that you'd like to attend. Once you've chosen a gym, click "More Detail' followed by 'CLAIM PASS' to access your free workouts! The passes will all be valid for 7 days so you still have time to enjoy them and can be claimed simply by creating an account and filling in a few details such as your email address.
So, what are you waiting for? Get yours while you still have time!