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The 30 hobbies closest to triathlon in what you actually do and how it feels. Each one says what's alike and what's different.
Riding a stationary bike indoors, in spin classes or on a smart trainer with apps.
Alike: Both active and rhythmic.
Different: Cheaper to start. More of an indoor thing.
The closest are Indoor cycling, Road cycling, Running, Trail running and Open-water swimming. They're alike in what you do and how it feels.
Road cycling is close to triathlon and quicker to pick up.
Running is close to triathlon and costs less to start.