Time to chime in again.
I agree with much of what Steve has contributed. It's especially true that water scrubs off momentum much more than ice, so each push is, to a large extent, accelerating the canoe from scratch. For that reason, it's necessary to ensure that the poles are planted angled well backwards. This ensures that the beginning of the stroke is most certainly not a pull. Rather, the arms are swinging by the body and pushing backwards. The commentary on the video also mentions that the stronger the current, the steeper this backward angle must be. I haven't done any biomechanical analysis, but have established a technique which feels good, which does not unduly strain me. I too, have an interest in preserving an ever aging body for many adventures yet to come. The original article also acknowledges that this technique will not propel a canoe against as strong a current as will traditional poling: the leverage just isn't there.
The manoeuvring depends to a large extent on hull shape and/or ability to heel. With poles well planted and the boat well heeled, little extra effort is required.My canoe has a relatively long keel line, so the bow is a little slow to respond. More of a rocker would certainly help. This is acknowledged in the journal of my 2013 through-paddle of the NFCT.
A couple of corrections:
Steve - as mentioned in the article and in my previous post, my poles have no straps. You're right - that would be asking for trouble.
Iskweo - I'm hoping your "guy thing" is a tongue-in-cheek comment. Really, as mentioned in my previous post, application of power without technique is likely to cause injury. I love developing technique such that less power is required. I also acknowledge that the strength requirement for this technique may put it out of reach of many. No-one is making it compulsory! And I'm not sure where my apparent lack of common sense comes into this.
Steve - (typing with a smile here - I don't do emojis) surely any successful propulsion of a vessel by means of one of more poles can be called "proper poling"? I know what you mean, but couldn't resist!
I'm in no way trying to undermine traditional poling, which is a beautiful art form as well as an effective means of propulsion when done well (and I wish I were better at it) I'm just trying to share ideas. I suggest trying this technique before judging it. Before consigning it to the file labelled "Arcana", give it a try in gentle conditions. Who knows - you may even find it easier than it seems!