Hi Gary:
Given you commented on sitting much of the day........
A variety of sources are finding that with the advent of computers and such, and as not only do more and more people sit, but they sit ALL THE TIME, it's causing huge issues with our glutes. They're chronically stretched, and they don't get used. The hips and glutes play HUGE foundational roles in walking, running and balance. And if they're not working well all sorts of issues can come up further down the leg - because the big muscles above aren't doing their job.
Therefore - my point is that it's good to get up and walk relatively frequently through the day if you can. My PT says the majority of the problems he sees are rooted in the fact that peoples' glutes aren't working well.
So keep walking!
Good luck with the program.
Jim