In triathlon training plans such as 80/20, what exactly is zone 5 effort?
For example in a run training session sometimes there will be sets of zone 5 for 30s-90s. Will the efforts at 30s be faster than the efforts at 90s? Or am I supposed to stick with a certain pace for both sets regardless of time? Or am I supposed to go as fast as I can for 30s almost like a sprint?
I know Strava provides training zones and it says my zone 5 is around 5:30min/km and this is a pace I can hold for maybe 15-20min. But to run this for 30s-90s would be pretty easy.