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There is a score, a ladder or an opponent in every one of these: tennis, table tennis, chess, five-a-side, poker, Brazilian jiu-jitsu, competitive gaming. Two-thirds need somebody to play against, and as a group they sit about as far from calm as this catalogue gets -- that is the point, the hour is sharp because it counts. Maybe not if you would rather not keep score, or if a loss follows you home.
52 hobbies. Each has what it costs to start, how much time it takes and a first session to try.