A bridge is collapsing, and our poor MC is stuck in the middle. The ground beneath them collapses, but they miraculously are able to climb up the falling debris and safely make it to the main land before the whole bridge is lost.
My question is, how fast would one have to move to complete this feat, or one similar, with gravity equal to that on Earth's? How taking would that be on the body? I know it is unrealistic, but that is not what I'm asking.