The Sufferfest videos work well with Trainerroad especially if you have some means of measuring power. Even if you don’t Trainerroad has calibration curves for a load of turbos so can use speed as a proxy for power. Once Trainerroad knows your functional threshold power the Trainerroad workout that goes along with each Sufferfest vid is then automatically adjusted to give you the optimum level of suffering.
Just drop the video into the Trainerroad window and it synchs the workout.
Sufferfest is aptly named but it is good for giving you more sensory input to take your mind off exactly how much you are suffering- until the last interval that is!
Problem with Angels is you’re toast at the end of the ‘warm up’ over/unders
I reckon you went too strongly at the start. Used with Trainerroad and a power meter I did the over and unders OK but by the end of the last climb I was blowing out my ar$e.