Endorphins, which are released during physical activity, are natural sources of joy that don't charge a commission. So today, put on your sneakers, get some fresh air, and smile at the world – your body and mind will thank you!

And do you know what works better for our faces than a cup of coffee? Exercise! Even a short session of running or push-ups can bring a smile to your face faster than a good meme.

Today we have an official reason to smile—and smile widely! World Smile Day is a great opportunity to remind ourselves that good humor is the best investment in health.