its worth adding that a lot of past(older) runners who retire through injury were training in very basic training shoes,plimsoles in some cases,
and in the 60/70 and 80s used to race everything from track to road to fell.
so most of the training was done on the road as the safe base terrain.
then there was not as much access to the fells,footpaths were not as established or marked as they are now and maps were very poor in detail.
when i first started racing on the fells in the early 80s,75 runners was a big field,the following week at a road race you would also see the same faces from the fells plus some out and out road racers,then you would see the odd bod at a track meet.
i think today with a greater understanding of training,the inclusion of hrms,better awareness of training routes,gps and well researched running shoes we have become less injury prone.
but,we have got slower too.
the times i achieved finishing in the top 50 then would give me a place in the top 20 today,if not higher,why???????