Really, it's 'work out', but too many of us would just roll our eyes and move on. Trust me though, 20 minutes of working out is one of the BEST ways to change your mood and lift your spirits and get your grown-up brain back in gear. One trick is to have plenty of work out options. See link below to "Fast Fitness to Go". You don't even need one lick of work out equipment.
Shay says: "Think of your workout as 'me time'. You are doing something just for you, and you deserve it."