Originally Posted by merlinextraligh

Because it doesn't make any sense to anyone else. 250 for one person is going to be an easy endurance pace, for another it's going to be V02 max, and for another an all out 30 second effort.

Also, it has to change for you as your FTP changes, or you won't being hitting your Zones correctly.

If you're going to do 3 minute intervals, you want them at 105%-110% of your V02max power or about 120% of FTP. Saying at 250 watts only makes sense if that is 120% of FTP.