It might sound like a game invented by a crude children’s television character but Fartlek is actually a highly effective type of training run.
Fartlek is a Swedish word which translates to “speed play” and in essence, it means running at varying levels of effort in one continuous run. For example, you could jog at an easy pace for five minutes before breaking into a fast one-minute surge, then return to an easy jog for a couple more minutes, and then do two minutes at moderate effort.
