Properties5

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The type of fuel your body uses to create energy changes when you increase your intensity. In zone 1 and 2, the main energy source used is fat. In zone 3, 4 and 5, you’re using carbohydrates as a primary fuel source.


Many runners train at a pace that is too high for their current fitness level. Their training intensity is in zone 3, 4 or 5, so they primarily use their limited supply of carbs for energy instead of stored body fat. Heart rate training flips the script on that method, showing runners it’s okay to run slower. In fact– almost all of us are running too fast. Slowing down leads to better fitness, less injury, and faster race times in the long term. Over time, it allows you to build a healthy and sustainable relationship with running instead of the constant crash-and-burn cycle that most runners experience through too much high-intensity exercise.