Abstract: An improved resistance-based fitness apparatus is described. This improved resistance-based fitness apparatus may be transformed in multiple temporary yet stable shapes by the user, such that the all or some apparatus subsections may move freely be immobilized in a fixed position or manipulated by the user into various shapes. An improved joint-based connector apparatus is further described herein which may enable the improved resistance-based fitness apparatus described herein to be transformed into multiple temporary yet stable shapes with subsections that are either freely moving, immobilized in a fixed position, or a combination thereof. This improved joint may connect one or more objects while also providing for three-dimensional non-coplanar movement that may be selectively locked or unlocked at a variety of angles by a single activating action (e.g., pressing a button). The improved joint may also be fashioned into useful devices in various other arts beyond the fitness arts.