Average_Joe wrote:
No it isn't only because of that. I agree that going straight from couch to marathon is probably irresponsible (or at least not advisable) but these people were getting injuries when they had tried to work up to 5 and 6 miles a run. Long before marathon-type training really kicked in.
I've seen plenty of new runners NOT aiming for the marathon with all sorts of similar injuries. I've seen people running for years who are prone to these sorts of injuries. Some people are just very susceptible to injury.
More likely they simply lack (enough) discipline.