I don't think I am hypoxic when swimming. I think it's a combination between the gentle rocking and the steady noise of my breathing. I can see the value in learning how to breath bilaterally, and learning how to regain your breath while swimming in open water, so I take it that is one set (350m in total) and a short rest is taken after each 350m? Not sleepy after, but during a long set (the ones to build endurance). I am usually ravenous after swimming. My go to snack is now watermelon after a long swim session. https://www.facebook.com/ReplayVideoAnalysis/ Jana from Replay runs open water training sessions at Hobart Dam. It's either on a Saturday or Sunday morning, and she will teach you some open water skills, plus run some drills (like how to draft, how to sight, have people swimming in tight groups, etc). Was reasonable for the session (R150 iirc). It's a bit of a drive for me, but was worth the trip.
