Interesting scrap. But what about guys with bad knees?
As far as the towel thing goes, good little ex. A bar of soap in a sock is even better.
But IMO, this is what shadow boxing and its incorporation of mental imagery should (help) accomplish. Trouble is, most guys just go through offensive motions of shadow boxing. they spend very little time doing exercises aimed at developing the muscle memory needed for good upper body (defensive) movement.
In fact, IMO, shadow boxing, when done properly and using all of your faculties, is better for defense than offense. It seems more guys just like to watch themselves in the mirror at how pretty their movement is, when in fact it is accomplishing very little.
just my opinion.
on that note, one thing I love to do is lean on the ropes and do random upper body movement movement and the accompanying defensive mental imagery. you can also throw nice straight punches of the ropes with either hand while visualizing your opponent throw punches back.
Your body doesn't know that the imaginary guy in front of you whose punches you're slipping and blocking isn't real.
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