Sure holding your arms out to type on a 'virtual' keyboard probably wouldn't give you gigantic arms, but most people would find waving your arms around to inter

Sure holding your arms out to type on a 'virtual' keyboard probably wouldn't give you gigantic arms, but most people would find waving your arms around to interface with holograms in the air tiring if they were doing it for 8 hours. I don't wave my arms around in the air when using a smartphone most of the time. :P Also, there are downsides to standing all day, just as there are to sitting.