Smartwatches that tell you how long you will take to complete a race normally base their predictions on just one parameter, but a new mathematical model based on two variables is more accurate
Source:
https://www.newscientist.com/article/2256239-smartwatches-could-predict-your-marathon-time-with-increased-accuracy/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home