Sing!

This really is as easy as it sounds… Sing!
Pick any song you like.  Sing along with some music or go solo.  Sing in your car, in the shower, or for an audience.  However you approach it, the key is to sing out loud and let your voice be heard (even if it is only heard by you.)
Studies have shown that when you sing, the vibrations created by the sound you make can help relieve stress and anxiety.  Reap extra benefits by singing an upbeat song that elevates your mood!