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Jigsaw puzzles, the bigger the better. It keeps you constantly mentally engaged and the act of reaching for pieces and looking around is good physical activity too. I get back ache if I do a jigsaw session for the first time in a while. It really tires me out before bed and can prevent that rumination before falling asleep. Finally it’s really cheap, there are limitless puzzles in charity shops and even some libraries lend them.
I’ve been planning for the last year some eco home upgrades, and awnings on the south facing windows are high on the list. With so many possible upgrades and so little money it’s difficult to know what to do first.