If you can hear someone running up behind you just make sure you're not walking three abreast taking up the whole pavement.

Or just, y'know, look around you and see what's going on in general, regardless of whether people are running or cycling nearby. 

Clergs, do you put bits of gravel in your shoes  last thing before you step out of the house every morning in order to maintain this level of blind rage throughout the day?

If I hear someone running up behind me I start to employ anti strafing zigzag patters, then stopping suddenly to drop the shoulder whilst tying a shoelace.

Yup.  my fave game is walking at full speed across waterloo concourse sidestepping people at the last minute when they are braced for impact

That sounds like way too much mental and physical effort involved for me, wang.