An athletic performance monitoring system, comprising: an altitude measuring system designed to obtain data relating to an altitude at an athlete's location along a route used for an athletic performance as the athletic performance is taking place, wherein the altitude measuring system includes a barometric pressure sensor capable of determining changes in barometric pressure; a first athletic performance monitor designed to provide data relating to at least one of a speed or a distance moved by the athlete during the athletic performance; a second athletic performance monitor that provides data relating to one or more physiological characteristics of the athlete during the athletic performance; means for storing data relating to the athletic performance, wherein the means for storing is designed to store at least some data collected during the athletic performance via the altitude measuring system, the first athletic performance monitor, and the second athletic performance monitor; means for determining whether a change in measured barometric pressure during the athletic performance is due to altitude changes or weather changes using data indicating the change in barometric pressure and data from the first athletic performance monitor; means for receiving input data relating to the route, wherein the input data includes information for producing an actual or animated representation of the route; means for displaying at least some data collected during the athletic performance via the altitude measuring system, the first athletic performance monitor, and the second athletic performance monitor in a time correlated manner, wherein, after the athletic performance has been completed, the means for displaying is further configured to display a virtual animation of the athlete traversing the route and corresponding data collected during the athletic performance. an altitude measuring system designed to obtain data relating to an altitude at an athlete's location along a route used for an athletic performance as the athletic performance is taking place, wherein the altitude measuring system includes a barometric pressure sensor capable of determining changes in barometric pressure; a first athletic performance monitor designed to provide data relating to at least one of a speed or a distance moved by the athlete during the athletic performance; a second athletic performance monitor that provides data relating to one or more physiological characteristics of the athlete during the athletic performance; means for storing data relating to the athletic performance, wherein the means for storing is designed to store at least some data collected during the athletic performance via the altitude measuring system, the first athletic performance monitor, and the second athletic performance monitor; means for determining whether a change in measured barometric pressure during the athletic performance is due to altitude changes or weather changes using data indicating the change in barometric pressure and data from the first athletic performance monitor; means for receiving input data relating to the route, wherein the input data includes information for producing an actual or animated representation of the route; means for displaying at least some data collected during the athletic performance via the altitude measuring system, the first athletic performance monitor, and the second athletic performance monitor in a time correlated manner, wherein, after the athletic performance has been completed, the means for displaying is further configured to display a virtual animation of the athlete traversing the route and corresponding data collected during the athletic performance.