+1

I started doing this after a back injury made it impossible to stand for climbing (I'm pushing a 69" gear). Then I noticed that something about my physiology makes it way more efficient than standing. I'm healed now but I still climb everything "in the chair".

As well, it's easier to keep track of where your knees are and focus on form/ not hurting yourself if you're seated than if you're standing up and bobbing around.