What is the 80/20 Philosophy?

The rule is simple: run 80% of the time at low intensity and 20% at moderate to high intensity. At this ratio, you're able to get all the performance-enhancing benefits of high-intensity work while avoiding the injury risk and fatigue that often comes along with it. 

The 80/20 rule was first reported in the early 2000s by Stephen Seiler, an American exercise scientist, who followed world-class cyclists, Nordic skiers, rowers, runners, swimmers and noticed that they all did approximately 80 percent of their training at low intensity. Matt Fitzgerald, a renowned coach, and certified sports nutritionist wrote about the philosophy of slowing down to run faster in his ground-breaking book: 80/20 Running: Run Stronger and Race Faster by Training Slower.

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