My kids joined a swim team, so I decided to try it as a work out (already had a membership at a gym with a pool).
I never swam as a workout before. I could barely do 500 meters when I started, switching up strokes (mostly free with my sad approximations of breast, fly, and back), having to stop and catch my breath often.
Now I'm at 600, have to stop much less often, and see some upper body development. I feel like swimming fits into the "muscle endurance" column from the article. I had just recently told someone swimming is like "upper body cardio".
So I'm curious if anyone else reading this swims and how you think it compares to other exercise regimens.