“10k steps a day isn’t a realistic or necessary target for everyone” does not mean “everyone should be sedentary”. Yes, we should be encouraging movement. Of course! I love walking, and I think it’s one of the best forms of movement. I also know that giving blanket recommendations that doesn’t always translate to real life doesn’t make sense. Keep in mind that the 10k steps a day recommendation initially started out as a marketing campaign decades ago. One study found that the health benefits (a