Hi, I have been training for 7 years martial arts and in my opinion (what my body said me) is that yoga is perfect, at least if you combine this with an explosive activity as kung fu, karate, football... I think that if your master of yoga is good, is not only about joints and flexibility, you can have other benefits as the nervous system, mind (which controls the body and create your personal drugs
) better for all the internal organs as pancreas, liver...etc
If the body works better inside, you will be better outside (like the spot says in the TV of my gym).
On the other hand I haven't study about joints as swanso, so I can't say that what it worked for me will work for every single man or woman.
Sorry for my English:P