I swim pretty often, but rarely just a 400 or 800 for time like we did for the DM stamina tests.
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My swimming is seasonal. I swim daily during the summer. I grew up in swim clubs & competing so it's second nature. Winter I always do the swims with my students, and I take my kids to the pool (but that involves something entirely different from swimming!) I believe a dive pro should maintain regular cardiovascular fitness of any kind. To me diving is a sport not a hobby (hobbies are sedentary activities imho)