Yet in spite of this, I've found it hard to find non-numbpad keyboards. Spend some time doing normal tasks and pay attention to this for yourself.
I move my arm a quarter mile a day extra because my keyboard has a numbpad built-in. This results in roughly a quarter mile of extra movement during the day (again depending on what I'm doing, unfortunately most content creation in Office applications requires TONS of this, internet browsing can be high if vimium doesn't work, coding is much less, etc). I use the number pad about 0.1% of the time my arm moves over it - maybe. I do this movement roughly 2-5 times each minute depending on my current task. My right arm is forced out slightly as compared with natural because of the extra distance. Each time I swap mouse/keyboard with my right hand I have about 13" EXTRA movement (numpad is about 6.5" wide). 
Having started a new job, I was finding my right arm somewhat more sore. Normally I use a wireless keyboard without a number pad and a mouse right next to it.
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