Former CIA Chief: "Changing the way that you walk requires some amendment to what you're doing. You're going to need a physical apparatus to make you walk differently. You can't possibly say, okay, now I'm going to limp. To change my walk, I put a little piece of gravel in my shoe, just a little thing that pinches my toe, and it changes my walk whether I want to or not. You can put a bandage around a knee, something that restricts you, will change your walk."
edit : a source : https://www.youtube.com/watch?v=JASUsVY5YJ8