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I found a cool DIY project I think everyone would enjoy, pre and post SHTF. A DIY wood burning sauna. Cool right? This project will not cost you an arm or a leg or a gym membership either, you could find a lot of the items needed on craigslist.
I would even go as to search forums and online salvage websites for free wood to build the hut, even a good old pallet or two would work well.
Check out this cool project below, if you ever get around to making it, please, please post pics, I may even attempt this when I find the time!