I'm a fairly keen walker (perhaps there's some nominative determinism there) .  For example, I probably covered more than 12 miles yesterday....but that was a day out walking, of which I do a fair few.
It would not surprise me if the mean average comfortably exceeds 5 miles per day, especially between the spring and autumn.
I'm so pleased that I was brought up to enjoy walking from childhood and to a greater or lesser extent have kept it up ever since.  Keeping "in practice" continues to be a great joy in life.....both with company or on on my own little jaunts.

 
I walk around 7 miles a day, one walk at lunchtime whether I'm in the office or WFH and also in the evening after dinner.

My work means that I am rarely at a desk all day so plenty of additional (unmeasured) pottering around but the 7 miles is "deliberate" walking if that makes sense.

I am fortunate to live in a rural setting where there are loads of options for very pleasant walking, great low impact exercise for those with ageing knees which spent too many years in the front row too!

 
A Facebook group - "Daily Mile Melksham" has been set up for April - "This is a virtual challenge to help you move more by getting out to walk 1 mile a day! Walking is the most underrated forms of exercise, let’s go!!!!". Nothing to do with me, but I'm going to take part and see how I can do in the case of my daily life and you can too!

I have never exercised just for the sake of exercise - I get easily bored and would much rather build my exercised into other things I do during the day. But it IS a good idea to keep tabs on how much exercise I get - again I would get bored logging that, but (accidentally) there's an app on my phone that I hadn't realised was turned on a while back and it's built a history.

Facebook group at https://www.facebook.com/groups/1179685273542626
More on my blog at https://grahamellis.uk/blog1549.html