There is nothing wrong with it Puke, and you will improve a general fitness, but you are more open to injury, and there are better ways of doing it for field sports.
But look, you can only try to help a fella so much, some people just will always think they know the best way no matter what. And for someone who knows a number of county hurlers i can’t believe you wouldn’t even talk to them about it.
I have only been doing it for a week but can’t speak highly enough of it…you can go at your own pace and do your own thing…Although i would recommend some decent tunes on your i-pod or portable music device to help pass the time while running
Treadmills seem to be fine by comparison. Invariably people end up with shin splints when they run on such a hard surface, and on top of that most runners, boots etc warp the natural foot fall, causing further injuries (to the hamstring in particular)
Many hurling teams can only do two sessions a week - do you expect these teams to do circuit training all the year round? That will heavily effect their touch and sharpness.