The question is, is snow an elastic surface? I think not. Is our body an elastic device like a spring? It can be at times in certain ways but the amount of energy that can be converted and stored as potential energy to recoil is minimal compared to the amount of kinetic energy we are talking about here. When we deeply flex our legs on the face of a bump, there might be a very small amount of recoil potential stored there, but not much. The energy didn't just absorb into the body, it had to either be converted in form or transferred in some way. Sometimes this transfer can be more complicated then we consider for example if you take a punch to the gut, while standing firmly, energy is transferred to the earth through your feet.
And by the way, does a car really "absorb" bumps on the road? I say yes it does, but the way it does it is by converting the energy into potential energy inside the spring rather then raising the car up in the air. so this conversion from kinetic to potential can be called "absorbing". The spring is eventually recoiled, but the dampener controls how fast it is released back to kinetic in a way that kind of makes sense so that it can lengthen back out in a way that will make sense for the terrain, ideally. when its not ideal, the energy will end up getting converted to some potential energy anyway.
The energy always has to be accounted for. If our body is supposedly absorbing all that energy, then it has to be explained how, as we are only somewhat elastic. But our bio mechanics are indeed very complex, and energy can be transferred from this body part to that body part, eventually transferred to the ground or another anchor, etc.. or can be heat and other bone breaking phenomenon. Ultimately, if the argument is going to be made that our body sucks up that energy into itself somehow like a spring does, it has to be explained how.
Edited by borntoski683 - 5/19/15 at 5:50am