Including a range of running intensity into your training is a great way to build your fitness by boosting your top end speed and also developing your ability to hold a sustained intensity within a single workout. This workout is great for athletes running a 10km or a half marathon, whether as a stand alone event or as part of an Olympic distance triathlon or an Ironman 70.3.
View More Friday Fartlek Run: The Running Channel’s Half Marathon Fartlek
