Tour de France 2009

Fixed.
The distinction is more subtle than you suggest by alluding to historical problems caused by poorly designed drug regimes. If 'harm' were the only criterion which distinguished cheating from not cheating, training would be banned beyond a certain level. The stress caused by a heavy training block have short term and long term effects on some aspects of health which are of similar magnitude to the harms caused by some proscribed agents.

Yeah, again, how many people have died from over-training?
I'm not talking about the old unknown dodgy ticker problem either.
You seriously think hard training is more harmful than stuff like EPO?
Merckx is 64 and still kicking.. you reckon he might've done a little bit of training in his time? Maybe exerted himself a little bit more than Joe Blow?