> 10,000 steps is the default recommendation of some of the most popular fitness trackers on the market

It's worth keeping in mind that much like "8 glasses of water per day", this recommendation does not have any particular pedigree (outside of trivia about the early marketing of pedometers in Japan). It's not clear that it was based on any evidence, and it isn't especially supported by the studies that do exist (which suggest that the benefits on mortality and morbidity for most people taper off somewhere in the range of 6,000-8,000 steps per day). It's a reasonable enough goal as far as it goes, but all signs point to it being chosen to be a "round" number and not because it's an actual estimate of anything materially meaningful.