What I would love instead of a "one size fits all" single modifier is an alternative exercise (or exercises). It would be hard if not impossible to have one modifier who would perform an exercise that covers all participants' needs. For example, I've seen a burpee modification where the participant steps back quickly instead of jumping into position. This alternative might not suit everyone (in this case that would be me) as moving into that position at all might not be recommended or the demonstrated pace is too fast to be a good choice. Some "low impact" alternatives can still be tough on those of us with back or knee issues as well. I have seen some instructors offer a main exercise and two "more difficult" and "easier" alternatives. Cathe actually did that somewhat in STS, IIRC, particularly with exercises like pull ups and chin ups that can be difficult for some of us (raising hand here). That kind of set up might work for more folks? Hope this makes sense!

I will do what I need to do with however the series is presented as there is no one better out there than Cathe IMHO, but it would be awesome to have a person to use as a "guide" for the moves I need to adjust.