Found this while surfing lifehacks.com today-- looks like a good, quick way to get some exercise into your day!

http://well.blogs.nytimes.com/2013/05/09/the-scientific-7-minute-workout/?_r=0

Requires no equipment (except for a chair). If you're feeling really ambitious, do the cycle 2-3 times with a minute or two of rest between the cycles.