Great post Jeremy. Thank you for commenting on the kinematics as we in this thread are at a point where we have a good commen understanding of the kinetics of sprinting.
Isometrics excercises: What intensity are you refering to?
Tendon will not be contributing to force return? Could you explain more in dept and do you have a reference?
When you speak of changing speeds from 10 m/s to 12 m/s and risk of injury are your refering to the increased load on the tendons when dealing with breaking forces. Is this comparable to overspeed running going from 10 – 12.. I would think the load is different but i cant put my mind on why? ideers?