I haven't been working out again because of my knee. I re-injured it last Thursday (June 2nd), and it is only now beginning to feel better again.
Swam 200m, back crawl and just random swimming
Treaded water for 5 minutes
45 minute core strength class in the pool
My knee didn't hurt at all in the pool so maybe swimming is an option I should be considering. The core strength class was different. I would say it was a low to moderate intensity work out. I spent most of my time wrestling noodles. I'd go to it again though.