Abstract: A hinge pin support for a resistance band can include a cylindrical body and an eye. The cylindrical body can extend along a longitudinal axis and can include a first end portion and an opposite second end portion. The cylindrical body can be insertable into a set of knuckles of a door hinge. The eye can connect to a resistance band. The eye can be coupled to a first end portion of the cylindrical body and can extend radially outward from the cylindrical body.

Abstract: A portable therapeutic device can include a handle, a rod, a resistance element, and an adjustment element. The handle can define a first slot and a second slot. The first slot can extend into the handle forming an opening in the handle and the second slot can be adjacent to the first slot. The rod can be translatable within the first slot and can extend from the opening. The resistance element can be disposed in the second slot and can be engageable with the rod to apply a resistance force to the rod. The adjustment element can be coupleable to the resistance element, and the adjustment element can be configured to adjust the resistance force.

Abstract: A portable therapeutic device can include a handle, a rod, a resistance element, and an adjustment element. The handle can define a first slot and a second slot. The first slot can extend into the handle forming an opening in the handle and the second slot can be adjacent to the first slot. The rod can be translatable within the first slot and can extend from the opening. The resistance element can be disposed in the second slot and can be engageable with the rod to apply a resistance force to the rod. The adjustment element can be coupleable to the resistance element, and the adjustment element can be configured to adjust the resistance force.