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The 30 hobbies closest to open-water swimming in what you actually do and how it feels. Each one says what's alike and what's different.
Riding a road bike on tarmac, from café loops to long, hilly days out.
Alike: Both active and outdoors.
Different: Costs more to start. More useful day to day.
The closest are Road cycling, Trail running, Running, Cycle touring and Swimming. They're alike in what you do and how it feels.
Cold dips & sauna is close to open-water swimming and quicker to pick up.
Running is close to open-water swimming and costs less to start.