Many companies in the US are providing gyms for their employees, making staying in decent shape that much easier. I definitely take advantage. Even when I don't have time for a full workout, I can hop on treadmill for a 30 minute run and be back to work in 40 minutes (assuming showers aren't all occupied).

I already do run to work, and it helps, as well as a reasonably active hobby. But there's a big different between running to work and a job that keeps you on your feet and moving for 40 hours a week.