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I've got the laptop, and other crap that comes with the backpack. Soon I'll have the opportunity to work from home, which will allow me to use my morning and afternoon transit time to be replaced with exercise (About 80 minutes extra all up)

I'm standing on a manual treadmill right now. I rarely walk on it these days, but at least it isn't sitting. Maybe consider a setup like mine? :) I use a shelf for a computer desk. It works very well and was cheap!