Sumo-wrestling suit - a good idea to train in?

What is it with people always positioning themselves right in the way when I am running? And I mean right in the way. Cannon Hill Park in Edgbaston is, what, 2km squared, and yet people - dog-walkers, cyclists, children, men in kilts, whoever - seem to look, see me coming, and gormlessly take a couple of steps into the metre of space I am just about to run through.

Not only that, but they seem to be oblivious as to what they are doing. I found myself in a situation at the weekend where I ended up boxed in between three people in a crowd. Approaching the crowd, I sized it up, realising there was no way around it without going half a mile out of my way, and saw a space through it where I would not have bothered anyone. But when I was all of five paces away, a man stepped into the space.

I stopped. The man looked at me. I looked at him.
He said: "Oh......sorry," as if he had only just realised I had stopped, and moved. I spent the rest of the run considering whether training in a sumo wrestling costume so I could shunt people out of the way instead of all this not-wanting-bother-anyone courtesy, was worth it.