Asking about boredom is a red flag for me. Most marathon swimmers have strategies for this and don't think about too much.
Occasionally I lapse into a ‘sleepy’ phase where my mind wanders – I lose track of ‘the now’ and drift off onto some thought thread – my swimming slows and gets lazy, then I ‘wake up’ and get back to swimming.
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It's not exactly boredom I suppose, but more of a struggle to resign to spending such a long duration swimming
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