And so initially, when we hit the ground with our foot, this spring compresses and so the force increases quite a bit, and we have the first force hump. And then we have a rebound. So the spring relaxes again, our whole body moves up and we fall back into the spring.

From a physics perspective, the human body does not "bounce" in the way a rubber ball does because it is not highly elastic. When a body hits a hard surface after a fall, the vast majority of the kinetic energy is absorbed through deformation, sound, and heat—meaning the energy goes into breaking bones, rupturing organs, and bruising tissue rather than being stored and released as rebound motion. However, in some high-velocity impacts, a body can exhibit a "deflection" or a secondary impact. Forensic studies show that depending on the angle of impact and the surface, a body can be "bounced" or deflected by as much as 1.5 meters from the initial point of contact. This isn't a "bounce" in the traditional sense but rather a transfer of remaining horizontal or vertical momentum after the initial crushing force. Essentially, while a person might "tumble" or "rebound" slightly due to the reaction force of the ground (Newton's Third Law), the body's lack of elasticity ensures it remains mostly "splat" rather than "spring."