Abstract: A jump rope has a spindle rod with two off-set of center parallel cord receiving holes running through its entire length spins freely within a grip handle allowing the cord to rotate free of friction that would cause it to twist and deteriorate. The off-set holes act as a crank mechanism allowing for more efficient cord rotation energy transfer, provide a place to store cord ends (means of length adjustment), and they allow for use of two ropes, and also could be used as a place to mount end caps. There are several cord length and configuration adjustment embodiments disclosed. One adjustment is by frictionally clamping the cord in a notch in an end cap. This feature stabilizes the cord at a desired length and also sets the cord off at about a 90 degree angle from the handles which, by acting as a crank, allows for more efficient and effective use of cord rotation energy. Another adjustment feature works by simply inserting excess cord length in the empty off-set spindle rod holes.

Abstract: A quick release strap system comprising,a molded plastic quick release male or female buckle component, a base and a conical aperture in the base coaxial with the center line, and an annular bearing shoulder formed interiorly of the base and coaxial with the conical aperture. The conical aperture receives a swivel connector having at least a pair of spring cam surface fingers adapted to be cammed toward one another by the conical aperture and a bearing ledge formed on the spring cam fingers contiguous to the cam surfaces and engagable with the annular shoulder bearing surface after the spring cam surfaces have passed the conical aperture. A strap having a pair of ends and means securing said one end of said pair of ends to said swivel connector opposite said spring cam finger.