Workout after bad night sleep

[MI-XC]

@Jataha

But my main question is should you do a hard workout if you have slept badly? Or is it just waste of time and you don´t get the benefit/adaptations of workout? Is it better to do just z2 until well rested to attack hard?

Start the workout, get through the first interval and then decide if you can continue. If not, sub for z2 and move on. I’ve had some really good workouts when I’ve been exhausted and failures when I thought I was fresh and rested.