It seems like one of those under desk ellipticals would be a better idea: http://www.amazon.com/FitDesk-Under-Desk-Elliptical/dp/B00Y1...
Mine stops within five seconds, so taking calls etc. is not really a problem either. Plus you can stand motionless on the side rails while it slows down.
And it's cool to hear you say that last bit because I feel the same way. I really need to sit down to work through through a complicated problems that requires focus. Emails and phone calls are standing and furrowed brow activities are sitting.
As a rule of thumbs if you multiply kilograms by 2 you get a rough equivalent in pounds ;-)
I can manage inches, feet and pounds quite OK but Fahrenheit are a bitch though.
Ha, ha, couldn't agree more... :)
Anyway, I looked it up just now, looks like you substract 32 from Fahrenheit and then divide by 1.8 to get Celcius: http://www.wikihow.com/Convert-Between-Fahrenheit,-Celsius,-...
One thing I've noticed is that I still have to sit down to maximize focus and think through certain problems. Alternating walking for 30-60 minutes, then sitting for a while feels natural.