In reply to Andy Gamisou:
I had a right hemicolectomy just under four years ago.
I wasn’t climbing at the time but was training and powerlifting.
It took me ten days to be able to walk 400 metres but then was walking 10 k within another week.
I wasn’t allowed to lift anything for 6 weeks due to the risk of incisional hernia, I did start working on my core and had fascial massage to minimise scar tissue.
Sneezing hurt like hell.
I started training again at six weeks and within six weeks had a reasonable level of fitness and strength.
I always thought I would never be able to deadlift again due to the forces involved but within a year was beating my previous bests.
My advice would be don’t push it and your body will recover.
The only effects I have now is that I, also go to the loo more frequently, generally I am more likely to have loose stools as less water is removed in the colon and spicer food is sometimes an irritant , although not enough to stop me eating it. The only effect from the operation itself seems to be I have one ab that aches a bit more than the others and occasionally pops forward but pushes back in place.