I wrote How Programmers Can Improve Their Fitness Without Going to the Gym, which is a good starting point for somebody wanting to improve their fitness. I even linking a bunch of backing studies!
As to low-carb diets, I have a site dedicated to exploring such recipes and information, Edaqa's Kitchen. Main point, don't stress too much here. Reduce sugar, replace white with whole grain, and you'll be a lot better off. Beyond that, skip the rice and pasta.
Thank you for the link to the post! I have read it and agree with all the provided action items to improve our fitness 👍
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