Running on a treadmill is going to be a lot more fun when you listen to fun music or can watch videos to distract you. Walk with Me Pro-XT Plus is a expandable treadmill desk that holds your laptop and tablet/smartphone, so you can walk and work at the same time.
Walk with Me Pro-XT Plus fits treadmills up to 34″ wide. Its elastic straps fit around rectangular and rounded treadmill handles. You can adjust the board to your desired length via the knobs available.[where to get it]