I don't have the answers, just asking questions, but how much does static flexibility/range of motion correlate with active/dynamic range of motion?
What I'm getting at is, does being able to lift the leg like shown, or the degree of static flexibility measured however, correlate to if an athlete has proper hip extension WHILE running?
I don't know the answer to that question. Just from my small cohort of athletes I've worked with, it seems like sometimes it does, and sometimes it doesn't. I've had guys who were so dang inflexible at the hips while standing around stretching or while doing hurdle drills, but when running, their hip extension was great. So what's the correlation?
I only ask because research has consistantly shown a negative correlation between joint range of motion and running economy. Obviously there is a point where one would be too inflexible and performance would be hindered. But in general, being flexible and running is a bad thing.
On the ankle- It's a controversial subject, but I think the ankle itself provides very little to propulsion in terms of active use. Meaning, active toe off contributes very little. Don't quote me on this, b/c It's been a while since I've looked, but in Frans Bosch's book Running, there was research that showed that only during the first portion of the stance phase is muscle activity actually contributing to propulsion, and that increased active toe off did not aid propulsion, and in fact toeing off too much just caused runners to flatten out. I'll have to look it up when I get a chance.
Also, for seb coe's weight training: there's an interview with George Gandy on
http://www.athleticscoaching.ca/
He talks about his famous circuit that Seb used.