Maximum Forces on the body

If we consider that the ratio between the distance from the forefoot to the ankle and the distance from the ankle to the Achilles tendon that is attached to the calf muscle, is approximately 3:1, the calf muscles must generate a force that corresponds to 10.5 times body weight in order to produce a force of 3.5 times the body weight at the forefoot (ground reaction force). Since the calf muscle requires an abutment, this force must therefore also act on the bone. So during everyday movements a force of 14 times body weight or more can act easily on the lower leg bones. For a person with a body mass of 80 kg this would correspond to over one ton, i.e., the weight of a small car.