"First 20 minutes"

I heard the author of this book on Fresh Air. Getting up is the first and most important thing to do - stretching is optional, be sure to stand up at least every hour, 20 deep knee bends to as little as 60 degrees 3 times a week - all this sounds possible and helpful.
I did stair stepping this weekend - helping my mother with stuff in their three-story house - another type of fitness.