Abstract: A jumper apparatus may include a ring, a set of poles along the ring and a pneumatic tube. Each pole of the set of poles may have a first axial end portion inwardly extending towards a centerline of the ring, a second axial end portion outwardly extending away from the centerline of the ring and a vertical portion connecting the first axial end portion and the second axial end portion. The ring is vertically located between the first axial end portion and the second axial end portion of each pole. The pneumatic tube may extend about the set of poles over the second axial end portion of each pole.

Abstract: A backpack may include a first panel having a first panel surface facing in a direction and a second panel. The second panel has a second panel first surface and a second panel second surface opposite the second panel first surface. The second panel first surface is inconspicuous. The second panel is pivotable relative to the first panel between (1) a concealment position in which second panel second surface faces the first panel surface and (2) a safety position in which the second panel second surface faces in the. The backpack further includes a safety optic formed on one of the first panel surface and the second panel second surface.

Abstract: A jumper apparatus may include a base, a set of poles, a pneumatic tube and a cap. Each of the poles extend upwardly from the base and circumscribe a circle. The poles have axial end portions inwardly extending towards a centerline of the circle. The pneumatic tube extends about the set of poles proximate the base. The cap secures the axial end portions of the poles about the centerline, wherein the cap comprises radially extending grooves receiving the axial end portions of the poles.

Abstract: A belt swing comprises a belt having a front edge, a rear edge, a first end and a second end for attaching to suspension lines, a lower surface and an upper seating surface. A plurality of treads are on the upper seating surface.

Abstract: A swing spring comprises a first plate or top, a second plate or bottom, guide rods extending between and connected to the first plate and the second plate, a third slider or slider plate slidable along an axis along the guide rods between the first plate and the second plate, a compression spring captured between the third plate and the second plate, a first hook rotatably coupled to the first plate by a thrust bearing and extending in a first direction along the axis, and a second hook coupled to the third plate and extending in a second direction opposite the first direction through the second plate.