bloviate and bloviate wrote:
I am Sam wrote:
Not sure how you can get it 'looking at' angles
Of course we would not be surprised if the absolute height of Walmsley's lifted knee was higher than Kipchoge's, considering he is 6" taller than Kipchoge. But 'absolute height' typically does not factor into the discussion when discussing one's 'knee lift'.
No, no, no.
We are not comparing 'absolute height' , we are comparing vertical oscillation, or the amount of unnecessary raising and lowering the hip and everything above that.
Let's say a runner of same height, same femur length has a 3cm oscillation vs Walmsley approx 10cm, their femur angles can actually be the same, with the knee lift, hip lift both higher by 7cm.
That energy comes from somewhere.
In the best scenario, you are swinging a high heel through in pendulum way....you cannot avoid some vertical COG change to allow swing through, though theoretically possible.
In the worst case scenario you are achieving stride by lifting the whole COG by higher knee and COG lift.
It's not that hard to compare side by side in slo mo.