Tuesday, called the gym asking do I need to book first, said no need, just bring id card.
Wed morning, go there, then they said must book 2 days in advance. I argue with them until they let me to redeem.
Finish redeem process, they said I'm not eligible for towel and locker room (they said it's inside terms and condition)...
One of biggest gym, not provide towel and locker room. Very funny. Decided not to use the voucher. Go to the gym across them. They gave me 2 days free trial!