I'm not sure I could concentrate on both at the same time. I'm very uncoordinated.
Same here. I'm in the "can't walk and chew gum at the same time" category. I can easily envison myself getting injured trying to do this.

That said, I have been forcing myself to go for a walk at lunch, and have put reminders that pop up on my screen to get up and move around every two hours to keep the circulation going.