People talk about "riding centuries"...imagine doing that day after day after day...imagine your body's immune system going haywire due to the extreme workloads, and not getting sick, not having one bad day for three weeks.
Produce these numbers...
Resting HR 32
VO2 ml/kg 84
Power @ VO2 600 watts
Maximum HR 201
Lactate HR 178
TT HR 188-912 (note that the TT HR is above lactate, so the ability to handle the acid and maintain the workload is pretty difficult..and then get up the next day and ride 120 miles at 22-25 MPH average)
Training miles per day and hours trained 5-6 hours and 100-130 miles.
If you can run numbers like these every day, day after day in all kinds of conditions, you can stand on the top step in Milan, Paris, or Madrid.
For perspective, take a look at some of the top US pro riders at the Tour of Georgia in comparison to the top pros like Lance, Voight, Julich...