<<Was wondering about indoor trainer machines though. Seems the type that Troy Jacobson sells do have "progressive resistance" but I don't know how it compares to a computrainer . I primarily use rollers with fan resistance too. Anyway thanks for the info... >>
GT, I should also stipulate that the progressive resistance should have a road-like feel, meaning that as you increase cadence within a gear or from one gear to the next, the increase in workload should be similar to what you experience on the road.
I am not familiar with the current device TJ is promoting, but know that previously TJ promoted Cyclops fluid trainers, a device that I find to be useless with its wildly disproportionate "progressive resistance" and unwieldy general feel. I will not coach an athlete that has such a device as I know from experience that they will be largely unable to execute the workouts and thus benefit from my program.
Computrainer, besides offering a very realistic road feel, provides great data feedback in allowing you to measure your fitness, observe pedal stroke, ride hills, etc.
To summarize, a big part of my Inverted Pyramid approach relies on:
1. having a viable trainer such as a computrainer
2. using the trainer wisely with concise 2-3 weekly 1hr focused sessions which if done properly can build fitness uninterruptedly for many, many months. See my article Indoor Bike Sanity.
http://www.triathloncoach.com/articles/sanity.html One of the primary benefits of my approach is that fitness is continually enhanced without much increase in training time---a key limiter for many athletes---especially in the cold and dark winter months where marathon indoor sessions become distinctly unappealing.