In honour of Charlie Francis- "...the difference between running and sprinting - that while you run on the ground, you sprint over it, with the briefest possible foot contact. It's like the spinning of a bicycle wheel; a sharp slap of the hand will impart more speed to the wheel than would a more prolonged stroke. The ...strongest sprinters spend the least time in pushing along the ground. They focus instead on moving their legs up and down, and are barely conscious of how their force is translated into horizontal impetus. They feel ease rather than power in their movement..." Speed Trap.