I'm also mad for climbing and yes 2-3 times a weeks does wonders for overall feeling, fitness and strength. It's also a very complete exercise unlike many other

I'm also mad for climbing and yes 2-3 times a weeks does wonders for overall feeling, fitness and strength. It's also a very complete exercise unlike many other sports. But the claim here is doing that at the end of your day still isn't sufficient in dealing with sitting for hours in row. Which I anecdotelly can relate to: I feel way better overall when not spending hours a day sitting. And when I go climbing after a 'standard' working day involving multiple consecutive hours of sitting I'll top at about 4 routes in a certain grade. However when I'm taking a week off to do some light construction works in my house and I go climbing after such a day, when I've been sitting for max 1 hour or so, and even if I already did a considerable amount of physical labour, I'll do 8 routes in that same grade. At first I thought it was a coincidence (like the routes in that grade just being easier or me just accidentally being better for some reason or...) but it happened time and time again in the last couple of years. I'm not 100% sure the not sitting is really the cause, but it is striking.