You can't talk about grip strength without knowing about Captains of Crush Gripper.

This book is written only about Captains of Crush Gripper. Nothing else is written about it. How was this gripper, which has captivated grip strength enthusiasts all over the world for a long time, born? What are its special features? How can you master it? Everything is written in this book.
To date, only five people in the world have managed to close the number 4 gripper. JB Kinney and Nathan Helle are among them, and they explain in detail how they managed to close the number 4 gripper and the training they used.
A5 size, 100 black and white pages.

I would recommend this book to people like this!

●People who bravely bought a Captain's Crush Gripper a long time ago, but couldn't close it at all, and now it's covered in dust and they're ignoring it. ●People who even hate this gripper because they can't close it even if they want to. ●People who lost to a girl in a grip strength test at school. ●People who think this gripper is expensive!