Going to share some of my favorites with ya'll and see if I can find any in return 
1)Captains of Crush Hand Grippers, I love them. I'm slowly but surely getting close to closing the #3. For those of you who don't know about them, these aren't your sissy grandma grippers, these are the real deal. The Trainer alone takes 100lbs to close, #1 is 140lbs, #2 is 195lbs, #3 is 280lbs, and #4 is a whopping 365lbs. Only about 14 or so people have ever closed the #4, the average guy can barely close #1.
2)Get a pair of pliers and a bucket, fill the bucket up with sand or barbells or whatever, and grab the handle with the pliers and hold it close as you lift and walk around with the bucket. Not fun, trust me
No cheating and putting it on your hip either.
3)Get two sledgehammers, put them together so the heads are facing opposite directions, and grab them and hold them closed and do various motions with them (nothing set, just have fun with it).
4)For pinch gripping, get two plates (I use 35lbs but if you haven't done it before, start more around 10lb plates), put them together so the flat sides are outwards, pinch them together, and hold it up in the air.
5)Another good test of grip strength are nail bending (which I stink at but can still get once in a while, I don't know the technique too well yet).
6)Try lifting weights with thicker barbells. You don't have to buy the ones for sale out there, I just took a regular one and covered it with duct tape until it was 3" around and thats what I do most of my lifts with (except for explosives, I go back to regular barbells for those).
7)Fingertip pushups work out well, as do wrist pushups (do them on the back of your hands) and forearm pushups (start off with your forearms flat on the ground, do a regular pushup, then go back down). Do them all slow though and tensing your muscles, try a count of 10 down and a count of 10 up.
Anybody have any others?

1)Captains of Crush Hand Grippers, I love them. I'm slowly but surely getting close to closing the #3. For those of you who don't know about them, these aren't your sissy grandma grippers, these are the real deal. The Trainer alone takes 100lbs to close, #1 is 140lbs, #2 is 195lbs, #3 is 280lbs, and #4 is a whopping 365lbs. Only about 14 or so people have ever closed the #4, the average guy can barely close #1.
2)Get a pair of pliers and a bucket, fill the bucket up with sand or barbells or whatever, and grab the handle with the pliers and hold it close as you lift and walk around with the bucket. Not fun, trust me

3)Get two sledgehammers, put them together so the heads are facing opposite directions, and grab them and hold them closed and do various motions with them (nothing set, just have fun with it).
4)For pinch gripping, get two plates (I use 35lbs but if you haven't done it before, start more around 10lb plates), put them together so the flat sides are outwards, pinch them together, and hold it up in the air.
5)Another good test of grip strength are nail bending (which I stink at but can still get once in a while, I don't know the technique too well yet).
6)Try lifting weights with thicker barbells. You don't have to buy the ones for sale out there, I just took a regular one and covered it with duct tape until it was 3" around and thats what I do most of my lifts with (except for explosives, I go back to regular barbells for those).
7)Fingertip pushups work out well, as do wrist pushups (do them on the back of your hands) and forearm pushups (start off with your forearms flat on the ground, do a regular pushup, then go back down). Do them all slow though and tensing your muscles, try a count of 10 down and a count of 10 up.
Anybody have any others?
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