1. Make sure you know where all family members are at all times.
As being tapped on the shoulder at 20 minutes into a 28minute run, when plugged into mp3 player, does cause a bit of havoc - and swearing! (on my part!!) he then decided that I ought to be going up an incline, and running faster. Given the cicumstances, I think I was very well behaved!....only used a few choice words and a swift elbow shove and managed to keep on my feet as well - (though goodness knows how!) needless to say son disappeared until I had finished. - fact is he should have known better at 20 years old.