![Stephen Seiler on Twitter: "Here is a 3-minute video I made looking at intensity distribution and heart rate time-in- zone, using a typical recreational "athlete" as an example: https://t.co/VV3HxXG2yl" / Twitter Stephen Seiler on Twitter: "Here is a 3-minute video I made looking at intensity distribution and heart rate time-in- zone, using a typical recreational "athlete" as an example: https://t.co/VV3HxXG2yl" / Twitter](https://pbs.twimg.com/media/DXImvSlXcAA0CGS.jpg)
Stephen Seiler on Twitter: "Here is a 3-minute video I made looking at intensity distribution and heart rate time-in- zone, using a typical recreational "athlete" as an example: https://t.co/VV3HxXG2yl" / Twitter
![Stephen Seiler on Twitter: "@NNestorprada @NNestorprada @StephenSeiler In response to your question about translating Coggan power zones to "polarized training model" intensity zones, I have made this little table. This is my Stephen Seiler on Twitter: "@NNestorprada @NNestorprada @StephenSeiler In response to your question about translating Coggan power zones to "polarized training model" intensity zones, I have made this little table. This is my](https://pbs.twimg.com/media/ENV0PuUWsAAytFP.jpg)
Stephen Seiler on Twitter: "@NNestorprada @NNestorprada @StephenSeiler In response to your question about translating Coggan power zones to "polarized training model" intensity zones, I have made this little table. This is my
![Stephen Seiler on Twitter: "Key take-home from studying top athletes is that intensity discipline is critical. My daughter is not an elite runner (yet), but she has embraced the intensity discipline part Stephen Seiler on Twitter: "Key take-home from studying top athletes is that intensity discipline is critical. My daughter is not an elite runner (yet), but she has embraced the intensity discipline part](https://pbs.twimg.com/media/Eb1U9HgXsAIJh6o.jpg)
Stephen Seiler on Twitter: "Key take-home from studying top athletes is that intensity discipline is critical. My daughter is not an elite runner (yet), but she has embraced the intensity discipline part
![Intervals, Thresholds, and Long Slow Distance: the Role of Intensity and Duration in Endurance Training Intervals, Thresholds, and Long Slow Distance: the Role of Intensity and Duration in Endurance Training](https://www.sportsci.org/2009/ss_files/image009.gif)
Intervals, Thresholds, and Long Slow Distance: the Role of Intensity and Duration in Endurance Training
![Frontiers | The Polarization-Index: A Simple Calculation to Distinguish Polarized From Non-polarized Training Intensity Distributions | Physiology Frontiers | The Polarization-Index: A Simple Calculation to Distinguish Polarized From Non-polarized Training Intensity Distributions | Physiology](https://www.frontiersin.org/files/Articles/433208/fphys-10-00707-HTML-r1/image_m/fphys-10-00707-g001.jpg)