Y'know that guy who never re-racks his plates in the gym? Or the one who leaves a puddle of sweat on every bench? Or the one who hogs the squat rack while he takes mirror selfies between sets?

Aside from having terrible gym etiquette (seriously, there are certain gym laws), there's a good chance these selfish gym-goers are also Debbie Downers.

new study, published in the journal Nature Communications, suggests the more generous and respectful you are, the happier you'll be.

In the study, researchers promised to give 50 participants money with the intent to spend part on someone they know (a promise of generosity) and the rest on themselves. Researchers monitored areas in the brain related to happiness while the participants decided who they'd gift and how much they'd give.

The findings show being nice (unsurprisingly) makes you feel better. Even the thought of helping someone can make you feel good.

It doesn’t have to be a grand gesture, either: "You don't need to become a self-sacrificing martyr to feel happier," study author Philippe Tobler, Ph.D., said in a press releasee. "Just being a little more generous will suffice.”

Don't have a surplus of cash to donate? No problem. Be more considerate on your commute, in the office, and in the gym.

Small tweaks can have you living a happier, healthier life.