Re: Buses and trains - effects on balance
I use it when I'm on a train or a bus, but that's not all that often. I've heard many people mention it, over the years. It helps train you to let the legs do all the reaction/absorption. The only problem is, IMO, that the force affects your entire body at once; it's not the same as a single attacking force coming in from an opponent. So it's not a perfect training tool in that sense.