Only you can use your PureGym PIN code. It's very important that you don't give your PIN to anyone else. This is a rule strongly enforced by PureGym staff.
Entrances to PureGym are monitored by CCTV 24 hours a day to protect the interests and safety of their customers. Anybody discovered to be flouting this rule by giving PIN codes to other people will not be allowed entry in the future.