The sedentary lifestyle is hard to avoid ~ part of "taking any job you can get" nowadays usually includes (1) finding work well beyond walking distance of your abode, thereby necessitating the use of vehicular transportation, either personal or public, and (2) sitting still all or most of the workday, whether in front of a computer monitor, customer-service counter, microassembly workstation, etc.

Then there's the fast-food factor. Corporations invest in extensive research to identify the sweet-and-salty flavors that humans find hardest to resist, and then package those flavors in products laden with "empty calories" and unhealthy fats, products that are so cheap to produce that they can be sold to us at low prices.

Therefore, it takes a conscious effort to schedule aftificial exercise periods as part of our days, where in the past our forwbearers got all the exercise they needed in their daily work routines ~ and then ANOTHER conscious effort to investigate the properties of the foodstuffs we buy, often having to invest extra time and/or money to eat healthy and avoid a obesity-inducing diet.

It's amazing that I'm not fatter than I am...