I have found that with Glidewalking, the type of shoes I wear really helps. For my daily walks, I wear very inexpensive "water" shoes which you can find at Walmart or Target. In the winter, I wear them with fleece socks. I really appreciate the flexible sole which allows a full range of motion to my feet. When I'm in the house, I'm typically barefoot so that I can get the most from my movements.
I also find that having flexible hamstrings helps alot with walking properly. I try to do hamstring stretches everyday, especially "legs on the wall" which is laying with your buttocks about 8" from an empty wall & your legs up on the wall spread to as far apart as you can. I do that for 3-5 minutes/day.
I'm really not sure if I'm Glidewalking properly but when I walk I feel it in my calves, back of the thighs & gluteals, to the point of being slightly sore. I should add that when I finally learned how to untuck my pelvis when I was standing, I felt the back of my body really working.