Unacceptance said:
You can never know, bro ... Uneven terrain, all those rocks and everything ... You just might get lucky and land your head on something hard.
(Sorry, man, had to, it was calling out to me. )
Ok, seriously now. No, in my experience, walking doesn't help much.
But running is a whole other story. Take it from the one in the trenches.
And no, it's not about sweating it out. It's just that once you're done, for the rest of the day you don't have the energy to think about anything else except how tired you are.
One run a day and there goes the depression.
Try and see.