Rugby players have a GPS tracker in the back of their shirts between their shoulder blades. The GPS tracker is part of a sophisticated biometric tracking system used by coaches to track a variety of statistics about every player. The padded casing surrounds a unit that is commonly referred to as a GPS tracker, although it contains other measuring devices. The visible part is the packaging designed to protect both the electronics and the player from damage due to the usual impacts in rugby. There are two ways that players wear the tracking unit. The unit can be carried in a specially made pocket on the back of the shirt, or it can be carried in a harness worn under the shirt. The GPS tracker measures a host of physical data emitted by the player, including distance covered, speeds reached, and overall heart rate of players. The data collected by the GPS tracker is used to manage a players workload to make sure that they stay healthy and able to perform at their peak for the entire season.