When I ride on the trainer alot I also get very sore. It's just the constant sitting making your sit bones sore. That will go away in time. The saddle sores could be poor saddle fit, or a technique issue. Are you getting chafed or getting those little blood blister type bumps? I was using a narrow SLR saddle and those popped up. Went to a wider seat with a cutout and no more bumps. If you are getting chafing/rubs you need to watch your pedaling technique. Sometimes on the trainer we get complacent and may move around more because we don't have to steer. Use a little thicker short for the soreness, and every few minutes get up out of the saddle. These are just my observations. You'll get more expert help from the pros on here. I quite honestly, always expect something. When I don't have an issue I am surprised but when sweating on the trainer, something always happens.



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I had never thought about being in the same position for a longer time, without the steering...steering is so much more interesting 

JMO.

