system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How accurate are step trackers? will 2 person of different physical size burn same no. of calories on doing an identical run ( same speed and distance ), does body metabolism matter outside of all physical aspects in such cases?
gpt
Some trackers try to account fir the inaccuracies by logging a certain kind of movement, allowing you to adjust stride length and enter your weight and height etc. but they’re never going to be totally accurate (neither is a calorie counter that tracks your meals).

That said, it doesn’t mean they’re useless. The data logged still gives you an indication of whether you mixed more or less than the previous day and how that’s trending with time. It should be roughly inaccurate to the same degree fir the same person one day to the next, so still useful for tracking progress, but not necessarily for comparing one person with another beyond a ballpark number.