re: breathing during swimming - is there a strategy to apply a similar technique whilst running; the mechanics of swimming with the periodic breathing opportunity feels as though it gives a more efficient control of heart rate/pace/energy-burn, but without that discipline during running or cycling you can take breath when you want .... giving system instability
(yes the environment in the pool is invariant versus run/bike & can also use a hrm/pm - but even so ; maybe listening to music/metronome can help)
Just breath naturally through your mouth, don't think about it. For your standard running you shouldn't have any labored breathing so it doesn't make any difference what you do. When running hard you are trying to maximize oxygen intake, so just breath is frequently with deep breaths, keep you head up high so your chest is open. Your body knows what to do, just let it do its thing. With swimming you are forced to breath in small time windows and there is a fairly fixed period to do it in. There are choices of what periodicity to breath in, and that will depend on swim speed and ability (some swim drills suggest no breathing for an entire 25m length!!!). When running things like foot cadence is far too high to do anything like breathing out when stepping down, so any mechanical link is void.
I expect you are just running too fast on your easy days if you are worrying about breathing. You should be able to have a full conversion with your running partner (or have a long chat with your wife/gf/mate on the phone), without the breathing interfering with talking.
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