Here in Canada saunas are very common, there are saunas of different capacities, some of them are for personal or family use. Many swimming pools have a water heating system and it is a pleasure to be in them or in the tubs in winter time. For rental, there are specialised places scattered throughout the cities; some weight training centres and machines have the service. Enjoy, it is a moment of purification of body and soul. Blessings.
It would be interesting to know how many saunas there are per capita in Finland. The ratio must be high!