www.youtube.com/watch?v=UA_Py8qTzm4
He gets to the 80m in 35 strides(knee raises) or 34 strides(foot contacts). Compare this with asafa and getting to 80m in 36 strides(knee raises) or 35 strides(foot contacts).
Comparing their 20m, it looks like they both get there in 12 strides(knee raises) or 11 strides(foot contacts).
For bolt he covers 20-80m in 23 strides which equals a 2.60m ‘stability stride length’.
For powell it was 20-80m in 24 strides which equals a 2.50m ‘stability stride length’.
Based on usains shape if I had to guess Id say it looks like this documentary is from 2011.
The asafa documentary was from early 2008 maybe.