Accurate step counting when using a treadmill

Hi there,

I mainly use my Venu 3 for step counting to hit my daily target.

As the mornings and nights are now getting (very) dark and cold. I was contemplating buying a walking treadmill so I can continue hitting my targets without needing to force myself to go out on a night and walk 2-3 miles.

So my question is, how accurate can step counting be on a treadmill (if at all) and what is the best way to setup/use the watch for this. Would the steps automatically go up with movement - or would you need to run an 'activity' for this to track/update.

Lastly, if not and the treadmill gave me a value of distance/steps I'm walked. Could this be entered manually at least, on top of whatever was already tracked in the watch?

Thanks in advance!