The second picture shows a different story.
This time, she was cued to take shorter steps and lean forward slightly as if walking into a stiff headwind. As a result, her center of gravity is already moving over her left heel when the foot touches down flat.
This fixes all three problems above and takes a lot of stress off of the knees, calves, plantar fascia and muscles in the bottom of the foot.
Your stride is a very automatic pattern that you've probably never really thought about before, so changing it will require some practice and patience.
Taking shorter steps can feel awkward at first, and if you’re used to walking at a brisk pace, you'll also need to retrain yourself to take steps that are both shorter AND quicker.
Doug Barsanti
ReInvention Fitness
P.S. If you're a runner and you overstride when you walk, there's a good chance you overstride when you run as well!