![Stephen Seiler on Twitter: "Where are "the poles" in a polarized intensity distribution for endurance athletes? http://t.co/X1hPwTcuE0" / Twitter Stephen Seiler on Twitter: "Where are "the poles" in a polarized intensity distribution for endurance athletes? http://t.co/X1hPwTcuE0" / Twitter](https://pbs.twimg.com/media/CKLnWmlWgAA6pUc.jpg)
Stephen Seiler on Twitter: "Where are "the poles" in a polarized intensity distribution for endurance athletes? http://t.co/X1hPwTcuE0" / Twitter
![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://sportsci.org/2009/ss_files/image009.gif)
Intervals, Thresholds, and Long Slow Distance: the Role of Intensity and Duration in Endurance Training
![Amazon.com: 80/20 Running: Run Stronger and Race Faster By Training Slower eBook : Fitzgerald, Matt, Johnson, Robert: Kindle Store Amazon.com: 80/20 Running: Run Stronger and Race Faster By Training Slower eBook : Fitzgerald, Matt, Johnson, Robert: Kindle Store](https://images-na.ssl-images-amazon.com/images/I/91m-gHr2XBL._AC_UL600_SR600,600_.jpg)
Amazon.com: 80/20 Running: Run Stronger and Race Faster By Training Slower eBook : Fitzgerald, Matt, Johnson, Robert: Kindle Store
![Stephen Seiler a Twitter: "@LozzaDr 80/20 recommendation is based om categorical distribution of whole training sessions. If time in zone is used this converts to 90/10" / Twitter Stephen Seiler a Twitter: "@LozzaDr 80/20 recommendation is based om categorical distribution of whole training sessions. If time in zone is used this converts to 90/10" / Twitter](https://pbs.twimg.com/media/DmpOKKIXgAcxnWT.jpg)