Fitness First @ Siam Paragon

These gyms are brilliant; immaculate and exceptional quality of facilities in really convenient locations. Kit and towels are provided as are free refreshments in their lounges. A couple are open 24 hours too. I teach here and live 90 minutes from Bangkok but travel in most/every weekend. If you're only visiting, you can get a free 3 day pass via the website. I recommend using this at Q House Lumphini Park (or IconSiam if you want a pool with a skyline view...) Once you're in, maybe pretend you're applying to be a teacher here (so they don't clock on to the fact tourists are abusing the offer..?) Either way, enjoy!

The steam room was nice.