That is great! Congratulations! Any distance running is no joke! For increased breath and oxygen use check out Tabata. Adding 4 minutes of Tabata sets will increase to a supra aerobic state. Should be able to take you a little further. Good luck. Be well!
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I do remember hearing or reading about this in the past, but It's probably time to take another look, thx.
Yeah, man. Tabata is no joke. You either get fit or die trying haha.