Movement creates a psychological tailwind.

Once you are in motion, a lot becomes easier that was hard while you were still. Decisions get made faster, other tasks seem less daunting, and your mood follows the fact that things are happening. This is one of the reasons acting before you feel ready works so often, because the readiness turns out to be a product of moving rather than a prerequisite for it.

On a stuck day, do something physical and small first. Walk, tidy, handle one item. Then approach the thing you were avoiding, and notice that it meets a different person than it would have twenty minutes ago.