In reply to dh73:
Back in my road running days I was very lean, due to running and a heavy manual job, in retrospect too lean as I suffered continual illnesses due to immune system under pressure and measles did me no favours for several years following. We cant simply try to achieve the body form of a pro distance runner as we have different lives and stresses to them, for a pro life may be eat, run, sleep and repeat twice a day whilst having everything monitored for you. A couple of pounds extra helped a bit. I started fell running and quickly put on a few pounds, but it was pretty obvious by looking at my legs where those pounds came from - I bulked up from the hill work.
Not sure everyone reacts the same as we are all different shapes and sizes, some top fell runners appear very lean in the leg (though well muscled), whereas I am quite short and stocky at 5ft6 and have very short legs which seem to bulk up rather than the long and lean option.
Horses for courses I suppose and everyone has to find their best. But like all things in life - If I could go back 30 years knowing what I know now...........
Post edited at 10:04