Posted: 05/10/2011 at 12:28
Moving past the indoor IM nuts why would you comments,
The swim is quite real , pool times for most folks will be quiite close to raceday( for a lake swim) i.e. out by a single digit percentage and for most within 5. conditions differ wildly though no current , waves being kicked and punched etc.
The run is different in terms of impact (much less) and difficulty most folk argue that 1% inclinde on tready is roughly equivalent to flat out doors , never really bought that or seen evidence for it though. Some folks find the tready mentally very difficult for longer distances , personally I dont mind it and have done a few half maras on the tready usually on the way back from injury.
The bike of course is where its very different when I first started training about 7 years ago I did a lot of gym bike work , before I purchased a bike , and found that the speed / power output was overstated by 25-30% bummmer of a discovery that. Of course as well no positional semblance and so no core work involved or wind resistance as stated.
A spin bike in the gym is more like it , you can with some work use your own cleats and get somewhere near a TT position I once did 3 and a half hours on one , (it had snowed heavily and then I owned no turbo) . However its still very difficult to judge how it relates to the real world.
On a turbo you can get very close to conditions when you balance the wind resistance / heating thing also you can see your actual power output and you can get programmes that take you virtually up famous climbs , I have a DVD driven Milan San Remo on mine which I like.
Clearly you are two stops short of Dagenham but crack on , enjoy and hope the ramble was of some use.