Bicycling is also a good way to build stamina and check out the world at a more leisurely pace. Smell the roses and all that.
For a while I thought you were going to talk about the paleo diet our early ancestors ate. Their entire job every day was to find food to eat and maintain shelter. Once fire was discovered there was wood to collect to cook and stay warm.
Between their diet and active lifestyle; they never got fat. Of course they didn’t live very long back then either but that’s not the issue here.
True, they had short life spans, But it was most certainly not from heart attacks, obesity, diabetes, etc. Those poor sould had no defense against germs & had to put up with big carnivore cats in abundance.