Although I only walk in these, they have really improved my running form.  You can't walk fast in these sandals unless you move your hips properly, so I now move my hips more when I run, which has helped me with my runner's knee.  Also, just putting these sandals on will often immediately alleviate my running injuries (knee pain, ankle pain, as well as sesamoiditis, which is a painful bruised feeling in the ball of the foot due to too much impact and inflammation).  I even walk around the house in these sandals!  The only problem with not taking them off is that they don't exactly smell fresh and new anymore and they're only a month or so old.