You have to book a session, but it's free. https://secure.rec1.com/MD/baltimore-md/catalog/index?filter=dGFiJTVCMTExOTYlNUQ9MSZzZWFyY2g9 is the site
It books up fast. Every Monday at 10 am slots open up. A session is 1.5 hours.
Its free. Just book a time
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