So, I'm training for IM. And I'm supposed to be riding up to 5 hours, hopefully 6 hours within the next few weeks. I've been trying to push up to this time for a while but I seem to have this barrier at 4 hours. Some days it's mental, some days it's physical. This weekend, I just did not want to ride any longer due to the heat.

I'm doing most of my riding alone, so it's hard to keep up the motivation on the long rides.

Does anyone else run into this problem and how did you "break though"?

Happy riding.