I am desperately trying to keep to a plan but all those 3 mins of this at brisk and then 2 mins easy and then...is driving me up the wall. My HRM is constantly bleeping at me and it ant easy keeping to easy pace around where I live (very hilly) or indeed on a singlespeed!

Is it ok just to keep to the spirit of the session such easy, base, tempo, brisk, etc, etc...This is a bit more like the language in last years training guides!

In addition I am a MTB cyclist in the main (although I do have a cyclo cross) so some of these sessions are tough to do off road in any sort of good order :-)