We evolved as hunter gatherers and have been hunter gatherers for most of our history. Continuously moving while collecting resources, even into old age. Today, most people don't continuously move. They go from bed, to work, to the couch at home, then to bed, with as little physical movement as they can possibly do in between.
Maybe if more people at least simulated how much a hunter gatherer moved a day, we'd see a much healthier population versus continuing this sedentary behavior that we have not evolved to do while remaining healthy. Agriculture which enabled a sedentary lifestyle for many people did not happen long enough ago for our species to be well adapted to this behavior; it was only 10,000 years ago, while our ancestors had been hunting and gathering for at least 2 million years, likely foraging even longer still.