heavy duty grippers

[evan]

I've recently started training with heavy duty grippers and I'm wondering if anyone else here has been doing that and if they find training with grippers helpful for upper body obstacles. I'm also curious if anyone here has been able to close the #3 Captains of Crush gripper (~280 pounds). Apparently you can get certified if you manage to close the #3 gripper in front of a referee www.ironmind.com:8080/ironmind/opencms/Main/coc3.html


my current progress

[evan]

GHP Gripper Challenge doesn't require a referee to be present,only a legit video www.gillinghamhp.com/gc.aspx