Sometimes we have days that just don’t go right. Maybe we ate something that disagreed with us, or the dog barked at every cat and squirrel all night, or we were out of coffee and we don’t seem to be able to get out of the funk. It might not seem like it, but exercise will probably help.
Caveats: I do not recommend working out when we are actually sick. I do not suggest doing anything super challenging when we are having issues with focus. We ALWAYS need to use our good judgment about what is appropriate for us to do and sometimes that includes hiding under the covers.
Now that that is out of the way, here is why exercise might help. There are the mood-elevating benefits of cardio that I’m always banging on about (because they are REAL!). There is the character-building thing that comes with doing the responsible and good-for-us task even when we don’t feel a lot like it. But one possibly overlooked good reason to work out is that it is a finite thing. We show up, we do the thing, and then we are done, feeling tired, but also virtuous and maybe even slightly more in control of at least some small part of the universe. This is not something to be sneezed at in our current unpredictable world.
Go play. It will help.