Five rounds for time of:
Underwater swim 25 yards
50 Squats
You can't swim at all above the water.. whenever you pop up you must not continue on horizontally. Pop back down and continue.. take as many stops as required and as much time as required.
For me the most time by far was spent on the air squats. I was taking a couple stops per length only for a couple seconds.. so each swim didn't varry too much, probably by less than 10 secs. per round for the swims... plus the swims are really short. The air squats were taxing though.
I did a bunch of warmups and Rowed a 500 in about 1:56.. that felt really good.. I was not really taxed at all on my upper body. mostly felt it in my hips.