https://www.on.com/en-gr/stories/beginners-interval-training-with-beamish-and-farken
George Beamish and Robert Farken, On athletes and runners, on interval training | On Greece
George Beamish and Robert Farken, On athlete and middle distance runners, on how interval training can make you fitter and faster on race day
george beamishrobert farkeninterval trainingathletesrunners