Do you have a hobby? Something you return to regularly that brings you pleasure, releases stress and takes your mind off the rigmarole of daily life? Something you do purely for bliss or that takes you into a flow state, first defined by psychologist Mihaly Csikszentmihalyi as the moments when you re completely absorbed in a task and time seems to not exist. He wrote about it in his 1990 book, "Flow: The Psychology of Optimal Experience."