I just got a bike after a 10 years break. I am starting to get in shape on a magnetic trainer.
I already have an internal cadence clock that makes me pedal at always the same rate.
I am wondering if I am better off using the low gear on my bike and a lot fo resistance on the trainer or the high gear on my bike and less resistance on the trainer.
In the end it seems to me that the only difference is the sound it makes because high gear makes the wheel spin faster.
I mix it up. I spend the first ten minutes or so in a low gear, spinning with little resistance, just to warm up the knees. Then I spend the next 20-50 minutes working a varied program of high resistance/low resistance, to try and keep things interesting.
Usually it is easier to set the trainer to a moderate resistance and use all of the different gear ratios that you have on your bike to change the total resitance. You can do this quickly and is a better simulation of what it is like on the open road.