From cliff jumping 13 meters and nearing ripping my hip out of it's socket by having my feet ever so _slighty_ apart, I can't imagine the amount of injury from 15,000 feet.
Fun fact, there is no difference between 2000 feet (about 600 meters) and 15,000 feet, because of terminal velocity.
It also means that in a free fall spreading your body out horizontally to increase the drag forces, then re positioning just before landing would be the optimal choice. Not that you think of that in a free fall, but the physics are there.
I wonder if there's some way you can actually do the opposite: First, gain all the speed you can (speed is energy). Then before you hit the ground, do a kind of "flare", where you make your body into a wing, and decrease your downward energy. Do this right to the point of stall (as close as you can get) to reduce kinetic energy when you hit.
I know it'd be basically impossible for a human to actually do this perfectly. But I wonder, in theory, how much one could reduce the impact energy. Maybe you could hit at 50mph instead of 120mph.
