68 yo, former middle distance runner.I intentionally walk uphill because it requires more effort than flat terrain. Many times I notice my Apple Watch reporting that I have walked 4 or so miles, most of it uphill, but the Exercise Ring only reports 19 minutes of exercise for the entire walk. Now, someone please explain to me how a person can walk for 4 miles, most of it uphill, and only show 19 minutes of exercise for it. Four miles of walking usually takes me over an hour.
Have you calibrated your watch recently? You can find the instructions on the interwebz.
I find that the Watch’s integration of height (approximate step length), pulse, mph, resting pulse, weight, age, and other measurements (possibly proprietary) accurately calculates my exercise minutes. My measurements may also be more accurate because I have a 7 and a 9 and wear a Watch 24/7/365 so it’s throwing everything into the mix.
BTW, unless you finish your walks in a different place than where you started, you can’t walk “most of it uphill”. My walk (on my rock driveway and a rock road) has elevation changes, but because I start and finish at my front door, the total elevation change is actually zero, regardless of what it says. See attached and look at the green graph.
And keep up your fitness routine!