I've taken improv classes for the past year, and it's really opened me up creatively. Employees and employers worldwide, in fact, could benefit from the lessons improv teaches—openness, innovation, focus, etc.—and I highly recommend taking a class. 

Improv isn't just relegated to comedy or the theater stage, though. It's also a big part of music and the songwriting process. In the following TED video, musician and researcher Charles Limb talks about how the brain works during musical improvisation. By putting jazz musicians and rappers in an fMRI machine, he discovered a new understanding of creativity and how it works.