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?
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France
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.