Swimming and martial arts

just went for a swim at lunch, 1200m.  I feel stretched out, worked out, yet refreshed.  In my experience, swimming is very easy to recover from, relative of course, to intensity. It does not leave me as drained as an equivalent run. Swimming also requires a relaxed full body extertion, and of course, a focus on breathing.  This makes it an excellent adjunct to FMA and other martial arts, and it is joint friendly.  And swimming in the ocean can be so refreshing, yet so humbling...an infinitely larger, uncaring opponent, that you must work with, not against. I am not saying that swimming is the only, or the best crosstraining for FMA, just that it has, as every activity does, some distinct strengths...and weaknesses (doesn't work the legs as much as running, and it can soften your hands for a few hours, leading to some unexpected blisters if you pick up a stick, or sword, or knife.)