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5°C (41°F) is very cold water for unacclimatised swimmers, especially if you're used to swimming in 18°C (64°F). You could probably manage a short dip (1 or 2 mins), but I would not plan for longer...
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5°C (41°F) is very cold water for unacclimatised swimmers, especially if you're used to swimming in 18°C (64°F). You could probably manage a short dip (1 or 2 mins), but I would not plan for longer...