The times for each run are added and the lowest total time wins.

CNN: Alpine Skiing

Those variables are then plugged into the Lorentz Transformation equations, which are used to determine the total amount of time dilation that occurs during your run.

FORBES: Connect

Once a run is completed and saved, runners will see a summary of how they did, including their total time, distance, average pace and calories.

ENGADGET: Garmin Forerunner 10 is a GPS watch designed for outdoor fitness, we go hands-on