Yes you can!
Add your gym to btwb here. The same way official affiliates do. You'll get a free 60 day trail. After that you'll need to pick a subscription option.
Subscription options for all gyms are as follows:
Members Pay: each individual member of the gym must pay for their own subscription ($7.99 per month or $87 per year)
Intermediate: allows the gym to add up to 50 Members for $80/month
Elite: allows the gym to add up to 100 members for $150/month
Mutant: allows the gym to add up to 200 members for $250/month
Please contact us at firstname.lastname@example.org if your gym has more than 200 members.
The benefit to choosing one of the group packages is that you get to offer an additional service to your members free of charge.