Well the reason I'm asking, to be perfectly honest, is that I used to have a serious problem with over-training, so much so that it led to a series of injuries.

It was suggested on this forum actually, that it may have something to do with a lifestyle mis-balance, or mentality mis-balance (these two, I have since come to believe, are very closely related), which was indeed correct.

But I discovered that the a change in lifestyle also led to a change in motives for training in the sport.

Or not even so much a change, as a jettison, as such, of certain motives, and thus, that which was pushing or driving me to over-train was negated, and my training came much better into balance.

I haven't had an injury since.