Recent content by spotmeter

Many runners twist in their upper body while they run. You can see this by watching the logo on their tee-shirt move sideways. You can also see it when their arms cross in front of their body instead of moving straight forward and back. We have found that runners do this because of tightness...

It seems to me that the runner has to do some work to prevent his body falling all the way to the ground. He mainly does this will his quads, preventing the landing knee from collapsing completely. He also uses his back muscles to prevent his upper body from collapsing. I would like to figure...

Thanks for helping me figure out the energy used going up. I would still like to calculate the force coming down as a percentage of bodyweight. Years ago I read that a runner with a 3" bounce lands with 6 times his bodyweight, but I don't know for sure if this is true, or how to figure it out. I...

I train runners to run more efficiently, in part by reducing their vertical oscillation (bounce), but I don't know how to figure out how much work they do during a marathon based on the size of their oscillation and their weight. I also want to be able to tell them how much falling force they...