I have met a curve I couldn't get up on my road bike. There were a couple of really steep switch backs after a long extended climb. I walked a turn and was able to get back on and ride the next switch back. Was I supposed to feel bad? It was part of an 84 mile day, so I felt proud anyway.

Walked way many times with the mtb. Usually it is skill not heart rate stopping me. So I'll run (if possible) up with the bike. I've had enough meetings with rock and dirt to feel ok with a less painful path. And there were some sand hills that stopped the 4wd truck as well as me...

I find walking or running up a hill keeps my riding partners waiting less. And my legs stay warm. Doesn't seem like you should feel bad about walking/riding your bike. You are still out there doing it!

SKM