I pace and read as my natural reading habit - just maybe 10 steps or so one way and then amble back the other way for as long as I read. It's not a concerted effort thing, just casual walking. To answer your q: it's helpful. Also can't sit and read

As far as the treadmill, though, one time in highschool dropped a textbook and actually reached down between my feet to grab it (because dumb) and did a full-ass somersault off the back of the treadmill in the middle of a gym - so as long as you supress the urge to grab a book you might drop, think you should be fine. Haha