![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
![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/image014.gif)
Intervals, Thresholds, and Long Slow Distance: the Role of Intensity and Duration in Endurance Training
![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
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