Timothy F. Kirn/Undark
More from Timothy F. Kirn/Undark
![Why are humans good at endurance running? The answer is murky.](https://www.popsci.com/wp-content/uploads/2019/10/04/IRYHOGC6GITG6EOKW6RXLULXAY.jpg?quality=85&w=800)
Fitness & Exercise
Why are humans good at endurance running? The answer is murky. Why are humans good at endurance running? The answer is murky.
October 5, 2019
October 5, 2019