How fast can a human run? To date, the fastest a human has been recorded running is Usain Bolt's 2009 record-smashing 100-meter dash. There, he briefly reached a top running speed of 27.78 mph ...

Because it is categorically unfeasible for a human to run 100 meters in less than one second, the limit exists somewhere between there and Bolt’s current 9.58-second record.

Estimating your VO2 max can give you insights into your cardio fitness. And you don’t need a lab to find specific stats. Try these three at-home VO2 max tests.