So I got myself a 1up trainer while I heal from a clavicle fracture. I've been off the bike about 6 weeks and now can finally use the trainer with limited weight on the bad arm.

How comparable is the effort required on the trainer for the gear on the flats? I ask because it seems that for any given gear, it feels like I'm exerting a lot more effort on the trainer than the road. Granted, my fitness has dropped over the past month and a half, but I can't imagine I've lost THAT much.

Before the crash I could go 2 or 3 hours of moderate to high intensity without much of a problem. On my third day on the trainer today, I struggled with half an hour.

Have I lost that much, or is the trainer's resistance making me feel like a wimp?