Apple Watch Indoor Run Accuracy

Hi,

I’ve seen this question asked a lot but no one has been able to give a good answer so I’m hoping maybe there’s something new out there. I have been running on a treadmill and specifically got my Apple Watch to track my runs. I have run outside and had no issues with the distance accuracy, but on a treadmill it’s another story. At first it was accurate maybe off by about 0.02 or something that didn’t matter. Now, about 3 years later and it’s off by more than a quarter mile and sometime even 0.5. I’m running 2 miles and It’s telling me I’ve only gone 1.5miles or less. This is really frustrating because all my workout data is inaccurate and it looks like i’m running 1.5 way slower than I actually am.

I’ve seen people say to reset the calibration but I’m curious what this actually does? When I click reset there’s a disclaimer that pops up telling me that if I do it, my workouts will be less accurate, seems counterintuitive to me. Not sure why Apple is putting that disclaimer there if it’s supposed to fix the issue.

Anyone have a fix to this?

Apple Watch Series 6

Version 9.3.1 (20S664)