LOTS OF UNDEMANDING TIME!
My horse gets "moody" if I don't work with him for awhile (like now b/c of the rain, sleet and mud) so spending undemanding time with him for a few days really gets his spirits back up. Basically, take your horse out to graze. That's it. You can go for a walk on-line, maybe play at liberty some, but don't start the "work" right off the bat. If you do, your horse many go, "Now, wait a sec! You weren't here in FOR EVER, and now you think you can just come back in here and boss me around?? OH NO YOU DIDN'T!"
I'm bein serious! Haha. So yea, undemanding time is FABULOUS!