nothing about Naylor’s physique would suggest any baserunning prowess. He stands 5-foot-10, is listed at 235 pounds and has a body type that bears a strange resemblance to a refrigerator.

It turns out he moves about as quickly as one, too. According to data from Statcast, Naylor ranks in the second percentile in the major leagues in sprint speed. There is almost nobody in the entire sport who runs slower than him.

Which is what makes this next part so shocking: Josh Naylor has helped turn the Mariners into a serious championship contender—by becoming one of the best base-stealers in baseball.