Well since I was ignored I'll go into more detail.
I know something called Myofascial Release. It is also known as Trigger Point Therapy, and a bunch of other things.
It's legit and it has tons of basing in science.
Here is the bible of it written by two doctors:
http://www.amazon.com/dp/0683307711/?tag=neogaf0e-20
There is also an easier to read version called Trigger Point Therapy Workbook:
http://www.amazon.com/dp/1572243759/?tag=neogaf0e-20
There's also:
http://www.myofascialrelease.com/
That's only the tip of the iceberg.
Forget the chi and spiritual flow malarkey, you can sell it that way to the hippies if you want, but it works scientifically.
On myself, I use a foam roller, which TONS of gyms across the country have started to incorporate. And used correctly, it's a god send.
I sit a lot at work, so I'll cross one leg over the other and wiggle my tight as hell hamstrings on the foam roller and after 5 minutes on each leg, really holding it in the bad spots and putting my weight into it, it loosens up a lot. Then I do that with my glutes. And thighs and shin muscles.
Check Youtube for 100s of video on how to use a foam roller. I also use a Tiger Tail for my neck. And a racquet ball for my calves, and entire back and shoulder blade muscles.
Scientifically, overworked muscles create muscular adhesions and toxins which lead to stiffness and pain while preventing bloodflow and nutrients and they don't clear out on their own no matter how much time you give them. Squeezing and pushing and holding onto the trigger point/knots/myofascial tissue/adhesion (all the same shit), cleans it out and you notice it after one session. If you keep doing it over time, son of a gun, you get better.
But you don't have to take my word for it. Grab a ball or foam roller and try it for yourself.