@NiveusLepus That's the spirit!
On your drive to the gym focus on those bright side emotions, really focus how grateful or happy you are getting back to gym. Exaggerate those positive emotions, try to feel it your heart. You will feel better
While at the gym think about what you want that failed (job?) But pretend you are already successful and doing it. You will feel better and hey that good thing might happen.
It's not new but I can confirm the benefits of purposely elevating emotions. ❤️🤞🧘♀️