More isn’t always better, especially when it comes to running. If you want to run faster, you can’t just add more miles to your current routine.

Trimming seconds or even minutes off your personal best requires a special blend of strength, power and mobility. You can’t build these things on the course or the trail.

A characteristic feature of a running body from the viewpoint of spring-mass mechanics is that changes in kinetic and potential energy within a stride occur simultaneously, with energy storage accomplished by springy tendons and passive muscle elasticity. The term running can refer to any of a variety of speeds ranging from jogging to sprinting.

Running gait can be divided into two phases in regard to the lower extremity: stance and swing.These can be further divided into absorption, propulsion, initial swing and terminal swing. Due to the continuous nature of running gait, no certain point is assumed to be the beginning. However, for simplicity it will be assumed that absorption and footstrike mark the beginning of the running cycle in a body already in motion.