Fartlek Running

Fartlek Running ?

What the hell does Fartlek mean? That's what I asked many years ago when I was training for my first marathon and subsequently used this technique of "improvised speed workouts" when I trained for Ironman. In essence, a Fartlek is swedish for "speed play". This method of training puts stress mainly on the aerobic energy system due to the continuous nature of the running session. The difference between this type of training and continuous training is that the intensity or speed of the exercise varies greatly, so the aerobic AND anaerobic systems can be put under stress. Most fartlek sessions last a minimum of 45 minutes and can vary from aerobic walking to anaerobic sprinting. Fartlek training is generally associated with running, but can include almost any kind of exercise - a great way to train for Sprint or short distance triathlons.

GymSkinZ released a "who fartlek'd t-shirt" a few years back which was featured in runners world in their 2007 runners gift guide.