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The flywheel air resistance creates really good inertia. Search TTforum or google, been discussed in detail.
It gives a good road feel intertia. It's not quite road, but is good. So the muscle recruitment is near it would be on road.
I love mine. Works for me. And improvements on Turbo give me improvements on road. If I keep doing some efforts on road, so my muscles stay used to variable terrain and the torque change.
Really enjoying the Lemond - did a 3x15 session - so around 1.5hrs with warm up/rest intervals. No problems, normally it is a real struggle to carry on for more than 45-50mins.