I used Plan Builder for the first time today and did the first workout (Goddard). The single leg drills caught me off guard since I was on flat pedals. My first reaction was: feature request for Plan Builder to prompt if using flat pedals to avoid including workouts with single leg drills…
But then since I was already performing the workout I tried to use my nonpower leg to just nudge the pedal over the top so that my power leg could work. Interestingly, I found I was able to work on the downside part of the power leg stroke ( 6-7 oclock) with better feedback about performance than on clipless. So now I think it does help to do single leg drills on flat pedals, but I still think that should be a choice. Please consider whether a plan builder prompt about flats would be sensible to exclude workouts with substantial time on single leg drills.