When it comes to exercise, I find that getting my heart beat up to a certain amount, then holding it there for about 20 minutes at a time, once per day seems to make everything come right. It could be partially because it is stimulating the pituitary gland.
I mean, it's great for weight loss and all that. But, I find it balances my mood, my appetite, my concentration, and everything else as well.
Usually I just try to go for a walk with a 20 minute run incorporated into it each morning or evening. If I can't make it outside for a run, I try to do a vigorous yoga routine, like the salute to the sun instead.
I get antsy if I don't do it, and then I feel sluggish all day.