I'm actually about to shift my workflow in a major way to include more movement. Already use an adjustable desk, standing in the morning and sitting in the evening. And when I'm on calls, I always use a headset and walk-n-talk.
Please don't take this as personal criticism. I just find it important to point out that there is a huge gap between what people unfamiliar with sport perceive as achievements and what actually are achievements. Just put in 4 hours of running and 4 hours of climbing per week and you will see for yourself.
Edit: Or I just failed to see the sarcasm in your post. Entirely possible :)
Seriously. Why do all of you born-again iron men have to come out of the wood-works as soon as people start sharing (not even bragging) their incremental efforts (you said it yourself: persistence) to lead healthier lives? We get it: you are better than them when it comes to fitness (well, the grandparent could be a former Olympian, for all we know. Or he might be an amateur sportsman who also has a sedentary job). Please stop one-upping people that are just getting off their feet when it comes to this.
[0] The importance of which seems to be distinct from exercising regularly, at least if you don't have time to exercise for hours on end each day:
http://www.theguardian.com/lifeandstyle/2012/oct/21/is-sitti...
My comment was just on the narrower idea of making the insane number of hours I (and most people) spend in front of a screen or on calls every day a whole lot less sedentary.