thumb|300px|right|A basic intro to the game of ptossing/desent.Ptossing (pronounced "tossing"--the p is silent), or as it's called Desent in the UK, is a game or fitness method which utilizes the method of perpetual motion training, and combines bodyweight exercises as resistance with varied-intensity cardio as a non-traditional form of intense outdoor exercise. It was inspired by the art of displacement (parkour, see Differencesbelow), and like parkour ptossing utilizes the environment as a tool of implementing the exercises; the driving force behind ptossing is to enable anyone to achieve high levels of fitness at any time of day from any location.