What is the best way to measure althetic performance in a game of football. I am thinking some sort of consumer level GPS product, a bit like this product but that seems not available on a personal level.
Does what I am looking for exist?
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If you're talking about measuring your own performance, there are certain shoes which have a gps tracker installed. For example the Adidas F50 adizero
If you don't want to buy an extra shoe for this there are also various sports watches with gps-trackers installed. As mentioned in comments, wearing accessories is not allowed in official games.