Today I climb after work.
I start by tackling an interesting V2 problem where you start by hanging upside down, proceed that way for several moves, then climb vertically to finish. I'm not able to get to the vertical portion, and I return to this problem several times.
I also attempt to climb this set of yellow holds just using my hands and no feet. I see another guy do it first and he inspires me to try. It's hard! He must be really strong.
When I leave I am more out of breath than I am tired in my arms!
...
A while later I can feel that my fingers hurt a bit. It was perhaps more taxing of a workout than I thought.