Are the tracks getting quicker — or the dogs?

Winning times are down - but how much of it is due to better track maintenance, asks Tommy Lyons.

Just days ago I watched a fascinating video, filmed in 2014, by David Epstein, for which the subject was ‘Are athletes really getting faster, better, stronger?’

Epstein is an investigative journalist, who wrote the New York Times bestselling book The Sports Gene: Inside the science of extraordinary athletic performance.