Freerunning is part running, part gymnastics. It is about moving fast, maneuvering over/under/ around/through obstacles, and placing your body where it needs to go. Freerunning/parkour is a popular pastime in habitats where open space is limited.
Freerunning whenever you need to overcome an obstacle via movement, such as hurdling a railing, rolling across the hood of a car, jumping across a pit, or swinging around a pole. Freerunning is also used for sprinting (p. 191, EP) and full defense against attacks (p. 198).
Example (optional) specializations include Balance, Gymnastics, Jumping, Running.