The Body Solid nun-chuck grip strength trainers are a great way to mix up your training and grow those forearms to new lengths. Want to have that grip crushing strength with your hand shakes then train with these Body Solid nun-chuck grip strength trainers. Add a new element to your pull-ups while varying the angle of your hands, making pull-ups much harder to do. Connect the strap through a plate with one grip and work on single arm strength. Hang from your pull-up rack and pretend you are rock climbing or working on your obstacle courses.