Swam for 30 minutes today. I started swimming 'with purpose' about a month ago. When I first started I was having trouble getting my body to allow me to do bilateral breathing (it only wanted to breathe on the right side) and I had to stop at each end of the pool for a few breaths. I was swimming about a lap a minute. Now I'm swimming 1.6 laps a minute and not stopping nearly as frequently. And bilateral breathing feels a lot more natural. Hooray for persistence.