How does braking stress the joints?
When the leg reaches ahead of the body and the heel contacts the ground, the energy absorbed by the leg is a result of the combination of the small downward velocity due to gravity and the impact due to the horizontal velocity. To visualize the horizontal motion, it may be helpful to think of the ground moving under the body rather than the body moving forward. At a 6-minute mile pace the horizontal speed is about 14.7 ft/sec or 10 miles per hour. The downward velocity is neg