Abstract: Exercise systems that include self-coupling weight pods that couple with one another to form weight clusters that a user can use in performing various body movements, such as exercise and conditioning movements. Each weight pod typically has a calibrated weight so that the user may know the amount of weight they are using. Each weight pod includes one or more coupling features that allow that weight pod to couple to one or more other weight pods and/or to an accessory, such as a strap. In some embodiments, each weight pod is soft so as to inhibit injury to a user of another close by the user. The weight pods can be used with one or more accessories, such as a strap, a bell bag that emulates a kettle bell, and a rucksack that can be configured to be a multifunctional component of an overall exercise system, among others.