It would be great to be able to build customized intervals on the Open XX videos.
this was supposed to be available last january. I think they backed out for some reason
No more comments where posted about this after a few users asked in facebook
Agreed, for now (if you use a computer) you can design workouts in the free software Golden Cheetah which has a workout mode. It runs on PC, Mac and Linux, but is not on phones/tablets. I assume having some sort of cloud storage synchronising designed intervals between devices is what has put them off implementing the feature.
I think I can also design workouts in my bike computer, but haven’t tried it out because I have a computer.