Even if you’re a runner, you may not have heard the term “Jeffing” before. It’s a method of alternating between running and walking and it’s become a popular way to train for long-distance races.
It’s particularly timely, as we appear to be in the middle of a second running boom, the first having taken off in the 1970s and 80s. You can see it in the popularity of parkrun, the rise in mass participation events, and the seemingly endless market for running shoes, watches and other gear.
