I basically do a yoga based stretching routine after all of my matches and hitting sessions. It's not a spirtual or meditative type thing, it's just a smooth progression of poses held for about 10 seconds each that leaves me feeling much less stiff, especially the morning after a match, where I will walk like Frankenstein's monster if I don't stretch. I used to resent always failing physical education tests in grade school because I could never touch my toes..how is that a measure of my physical fitness, it's genetic!! I could do more sit ups than anyone in the school, and beat all the other measures of fitness handidly. Stupid flexibility!! Anyway, there certainly are aspects of yoga that could be uncomfortable for someone with certain injuries, and it is no more beneficial to tennis than a well thought out modern stretching program.