Public pool, city owned. August daily was less than 1€/day. Now I'm taking classes (my style... has room for improvement) not sure about the price for the winter months, but it's subsidized so not very high.

TBH, gyms have lower prices now over here. You can find a decent subscription for 30€/month, half of what used to be. But they're overcrowded. For me the main factor is time. I end up wasting a lot of time waiting for a free spot or shower, changing clothes, etc. Training at home is much simpler. Combined with a couple of days out swimming or running, a better solution, for me anyway.

Edit: between my previous comment and this one, I've completed my daily home routine :-)