The video listed the benefits of strapping being: Improve muscle tone, promote circulation, and build muscle. I'm sure daily grooming (with curry and everything) does well enough to promote circulation and appropriate amounts of work/exercise will cover the muscle tone and building.
As many have said, a horse who is not used to this treatment may take it as punishment or generally just something uncomfortable/bad. I wouldn't risk it, personally.
I wonder if using one of those hand held massaging vibrators would have the same benefit. I know they are good for getting a horse used to clippers. You wouldn't be "beating" your horse that way either. Anyone ever used one on their horse?
It used to be common practice in the UK, I think, but know almost no one evn knows how to do it or even what it is. Maybe some racing yards, but not many.
I think it is beneficial, but yeah , it depends whether your horse will put up with it. Then again, apparantly some horses LOVE it!
That reminds me of something people would have done to them at a spa as part of a massage. I think depending on the horse, some may like it. You would probably really have to know your horse. I could imagine a couple of my horses liking it on the rump/neck area. I might try it a little softer though :). I have always been interested in equine massage - whenever I give them a little rub or rhythmic pats they seem to really relax.