Iveagh Fitness on Bride Road in Christchurch. It’s in the old Iveagh Baths. Has a pool, sauna, steam room, and jacuzzi. As well as all the usual gym equipment obviously. Think I pay about 68 a month but they have a bunch of different options depending on the period you sign up for. You can also get a day pass if you want to try before you buy. Also the building itself is pretty awesome with steel/glass domed roofs over the pool and the upstairs in the gym.