In earlier posts I shared videos on bungee chord up and down waves. This is a great tool to build up grip endurance. It really works the forearms rigorously since you will have to hold on super tight to ensure the rope does not slip out of your hands. In video below I wrap the chord around my hand so I am not working my grip as much. I do this exercises with and without the chord wrapped around my hands. If you do it with the chord wrapped around your hands, your grip will not be fatigued too early so you can go for a longer duration and focus on the conditioning of shoulders, triceps, biceps, lats and traps.