This is all heartening stuff mate.
Sounds like Doc Pain is a good find . . . too many physicians have a dislike of marathons. Nice to find a kindred spirit. Can't say I condone his views on step-back weeks though. Even psychos like Sam Lambourne see the virtue in resting the body every now and then. Running causes all manner of injuries, most of them miscroscopic tears in the muscle fibres that simply cannot heal without rest. The older you get the more these compound, hence an increase in more serious, detectable injuries.
It's alright for these young bucks. They still see themselves as immortal.
We old scroats know better