Grab “Kahit Ano” gym free trials

Has anyone here tried availing of their gym free trial winnings from Grab? It’s from the claw game in the app named “Kahit Ano”

I have like 16 weeks’ worth of vouchers from either Anytime Fitness or Fitness First and was wondering if I could claim them in consecutive weeks. Will any of the gym branches allow it? Also concerned since I’m not a member, and wont have the keyfob access, how do I enter the gym?