As an anecdote, I knew one old guy who swore by this program. He was in his 80s and could keep up with adults in their prime when filling sandbags all day.
He said it was the only exercise he got most days, but he did it every morning.
Hard to believe how sedentary people can get that such a program can makr a diff.
I moved to the NE US after living in the midwest most my life, and the amount of walking ube had over the last 6 years has done wonders for my daily health.
Something like https://en.m.wikipedia.org/wiki/5BX