Performance training tool

Abstract

Disclosed herein are tether lines comprising a handle; a grapple, comprising a body, two stationary arms, and a swing arm configured to rotate around a pivot point in between the stationary arms; and a cable connecting the handle with the grapple. Also disclosed are methods of temporarily restraining an athlete, the methods comprising providing a tether line comprising a handle; a grapple, comprising a body, two stationary arms, and a swing arm configured to rotate around a pivot point in between the stationary arms; and a cable connecting the handle with the grapple; connecting the grapple to the athlete; and applying pressure to a release trigger on the handle, thereby causing the swing arm to swing open, thereby disconnecting the athlete from the grapple.

What is claimed is: 
     
         1 . A tether line comprising:
 a handle;   a grapple, comprising a body, two stationary arms, and a swing arm configured to rotate around a pivot point in between the stationary arms; and   a cable connecting the handle with the grapple.   
     
     
         2 . The tether line of  claim 1 , wherein the cable comprises a coaxial cable comprising an outer, shell cable housing and an inner, strand cable. 
     
     
         3 . The tether line of  claim 2 , wherein the cable passes through a first nut before connecting to the handle, and through a second nut before connecting to the grapple;
 wherein the first and second nuts are configured to secure the shell cable housing to the grapple and the handle, respectively.   
     
     
         4 . The tether line of  claim 1 , wherein the grapple further comprises a first pivot, around which the swing arm rotates. 
     
     
         5 . The tether line of  claim 1 , wherein the grapple further comprises a release arm configured to hold the swing arm in the closed position, wherein the release arm is connected to the cable. 
     
     
         6 . The tether line of  claim 5 , wherein the grapple further comprises a second pivot, around which the release arm rotates. 
     
     
         7 . The tether line of  claim 5 , wherein the release arm comprises a hole configured to receive a catch on the swing arm when the swing arm is in the closed position. 
     
     
         8 . The tether line of  claim 5 , wherein the release arm is connected to the cable. 
     
     
         9 . The tether line of  claim 5 , wherein the grapple further comprises a spring that brings the release arm to its neutral position once the pressure on the cable is released. 
     
     
         10 . The tether line of  claim 1 , wherein the handle further comprises a release trigger connected to the cable. 
     
     
         11 . The tether line of  claim 10 , wherein the cable connects the release trigger on the handle to the release arm on the grapple. 
     
     
         12 . A method of temporarily restraining an athlete, the method comprising:
 providing a tether line comprising a handle; a grapple, comprising a body, two stationary arms, and a swing arm configured to rotate around a pivot point in between the stationary arms; and a cable connecting the handle with the grapple;   connecting the grapple to the athlete; and   applying pressure to a release trigger on the handle, thereby causing the swing arm to swing open, thereby disconnecting the athlete from the grapple.