Let me guess, you're either a frail little twig or a barely mobile lard ass.
Try exercise and diet, then you'll be able to move more comfortably and without losing your breath.
the problem with majority of these virtual reality companies and tech is that they try to be too much.
what they need to break into big market is VR gaming.
you know what's the best way to actually play for 3 hours with an oculus rift? a fucking space mouse? kinect? what the fuck. of course not. best way is to sit on sofa with either controller or sofa compatible mouse and kb. essentially you're just going to replace your monitor with the thing - and no it's not the same still as using a hmz-1 or something like that. the immersion is vastly superior and the head movements should work - BUT the head movement should be just something optional. like, if you need to use your head movement even for up/down looking it gets really tiring and aiming becomes a chore. good example about this is how hacked in vr support in hl2 was better than actual "virtual reality support" in tf2, because they tried to make too many modes in the official vr support. just having mouselook functions perfectly - and the head movement then just mapped another mouse. does this disorientate people? probably those who can't play fps's anyways - as a feeling it's not that much different than looking at a screen and using mouselook. the point however is that it doesn't tire you so much.
full movement virtual reality for home games is a wii motion control like gimmick - you just can't make it work and the disconnect is so huge anyways, you can't have tactile feedback anyhow.
just make a high res 90 fov+ head unit and it will sell like hotcakes. console and pc gamers will buy it in troves and just use their old desk or sofa and controls, trying to turn the room into a minority report joke ui is a bad idea(virtual high resolution monitors, 360 degree desktop and such not so bad idea, but would be interacted with kb and mouse finely.
if waving the hands was a good ui for day to day work, then we would be using something quite different from the old typewriter style we have.. the typewriter is better than the pen.