Running is a quintessential part of Spartan racing. It is the base of every race distance, and it's what takes you from obstacle to obstacle. As a Spartan, it is impossible to get through a race without running.
At any given time, Spartans must be able to transition into explosiveness to jump over a wall. Spartans climb up and down mountains on their legs, pick up heavy objects, and carry them throughout the most difficult of terrain. The legs are responsible for powering a Spartan through every demand.