So on Monday, in an effort to get closer to Team Voice's mileage goal for the month, I walked 4 miles on the treadmill, combo of inclined and speedwalking.
Then on Tuesday, ouch ... the knees were complaining ... and today ... are still complaining.
Lesson learned? My knees want to do 2 miles of incline/speed walking every day during the week. Then they will let me do a timed run on Saturdays without complaining.
So although I'd like to keep meeting the mileage goal each month, for now I've reached my limit and will obey my knees! I can still build up leg muscle and cardio by doing 2 miles a day inclined, which will then help me build up my on-pace mileage over time.
My knees are happy about my decision, and my left ankle is cheering too!