That’s the overriding thought pattern in my head whenever I’m working out in the small office gym we’ve set up. Our jobs are so physically undemanding, we’d turn to jelly if we didn’t work out. As a kid I remember thinking it was funny that astronauts in zero G had to work out regularly to keep their muscles from atrophying. But these days, in any tech-based job or other cubicle farmhouse, it’s only slightly less essential.