When you wear a weighted vest to walk or run, you're adding a lot of stress to your joints for not much in the way of an increased calorie burn. Every additional pound that we carry adds FOUR pounds of stress to our hips, knees, feet, and ankles (which is why weight loss is so beneficial to those of us with joint issues!) If you have any problems with your joints, you might want to reconsider the vest. Increasing exercise intensity instead of increasing bodyweight can boost your calorie burn without damaging your knees, hips, or ankles.