One problem with some weighted vests is that due to tightness in the shoulder girdle, in movements like pull-ups or high range of motion pushups, the vest can be shearing, either damaging the person or in some cases, the vest itself being slowly torn away. This can also be seen as an advantage, however, in those who wish to limit their range of motion due to lack of strength or flexibility, to avoid injury. The limitations of front and back bending of the core is for example, contrasted by ergonomic construction to encourage good posture in modern weighted vests such as the x-vest, hyper vest or game-breakers pro suit.