Running stride angle vs length calculation.
Debunking of stride angle calculation pointed here: http://bit.ly/LX3kmR. At 89 deg, we have a stride length of ~4.2. At 106 deg, we have a length of ~4.8. 4.8/4.2 => 14% longuer stride lenght instead of 34% as implied in the video, where front leg becomes much longer. If you want to see for yourself, move point C.