The 'Pass Over' is a great exercise for anyone but particularly those working at a desk all day, your shoulders can become tight from being in the same position for hours and this provides an effective way of loosening them up. It helps to warm up and stretch the muscles in your shoulders, arms, and back. Your hamstrings also get a nice stretch with this one.
Check out the video below for a demonstration.
https://www.facebook.com/CityCentreChiro/videos/1697773220259423/