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Every one of these is done sitting down, at a desk or a kitchen table, at home: drawing, chess, crochet, journaling, calligraphy, origami, scale model kits, crosswords, learning a language. None of them needs a spare room, a booking or anywhere to be -- a table or a corner is the whole requirement, and most of it packs away in a box. Maybe not if what you actually want is a reason to move or to get out of the house, because nothing here will raise your heart rate; if sitting still all day is the problem rather than the plan, the outdoor and physical lists are the better place to start.
152 hobbies. Each has what it costs to start, how much time it takes and a first session to try.