For me, what doesn't work is trying to write it out on the computer. Writing down thoughts requires a level of clarity that I might not have yet for a particular task. I find that a shower or other bathroom break helps to organize my thoughts. Walking outside is a bit too distracting.

I need to try to get up from my desk more when stuck. There's a bit of inertia to overcome in getting up from my seat, but it would probably be more efficient, thinking wise.