DRAGONDOOR.COM has a really good video called "Relax Into Stretch" by Pavel Tsatsouline. It worked great for me. I have never been flexible. I do jiu jitsu, and russian kettlebells. After following the video I had instant results. Look at the sit www.dragondor.com.
I just got out of the military. All the tarining we have done the best IMO was Ron Donvito (google his name). He currently trains the 7th Special forces group, and a few of the seal teams stop by at his place in North Carolina. He is highly knowlegeable and by far the best training for CQB and...