This may be an old thread but i totally agree with what Sailer and Anibal5 are saying.
I tried using RPM (or Spinning i think you call it in the US - anyway, a cycle class at the gym) to train for soccer one summer. I was superfit at cycling, but when it came to running, i was not fit in that running has the resistance of your feet hitting the road and pushing off, which obviously cycling does not have. Treadmills are the same - because they have the treadmill running underneath you, your legs do not get use to having to push off to keep forward momentum going.
If you want to get fit for running - run
If you want to get fit for cycling - cycle.
Use other methods to break up your training regime so it doens't get too boring!
Otherwise its like diet - everything in moderation!
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