This short video from Runners World, Get Off Your Butt: Reverse the Damage of Sitting Too Much shows some simple exercises to do for runners that have desk jobs. Desk jobs are not good for runners leg muscles. Even when you get up, your muscles remain in their shortened position, which forces them to work harder when you call them into action. Practice these stretches to help your leg muscles and be sure to try to get up and stretch about every hour while at work.