In running, the body's motion is the direct result of the combination of three forces: gravity, the force of the muscles, and the force of the atmosphere. When you run, these forces are in constant interaction, resulting in a unique and characteristic movement that is the characteristic of running.

In running, the body is in a state of constant motion. In order to be able to run, the body must be in a state of motion, and this can only occur in the absence of any impediments. If there is an impediment, the body will be forced to stop, resulting in a loss of momentum and the need to start again.