I'll put my private reply to vbm here as well, just in case anyone else wants to try this:
First impressions of this routine: There are some good dynamic moves that can be used for warm-ups and pre-workout stretching, but it's not flexibility
training at all. A 12-count is way
too short for any decent flexibility work. Now I have no idea about football training, but I suspect they work a lot with heavy weights, in which case this stuff probably won't improve their flexibility at all.
The "hip stretch" (#10) at ca. 5:20 has no hip function, it does however stretch the hamstrings very well.
#11, the "hurdler stretch" is no longer recommended due to strain on the medial ligaments of the knee, I have some references on this somewhere, I'll see if I can find them.
For stretching and flexibility info I usually go to http://www.cmcrossroads.com/bradapp/docs/rec/stretching/
- I own Tom Kurz's stretching book, and while it's a challenging read, it's the best I've found on the subject. See the articles section, it has tons of free info.
The main thing about stretching is, just as with any other exercise, you've got to know that your goal is. Do you want to kick head high, Or are you just looking to maintain mobility?
The myth about post-workout stretching decreasing soreness has been proven to be just that, a myth, although a cool-down with some light stretching can be good for other reasons. (I have some references here as well, but I need to dig through some bookmarks)
Well, rather than me parroting badly, see the above links for a better explanation.