Using grips

Saw some youtube vids of Roelly Winklaar doing back and it looked like he had sponges in his hands at all times when he was gripping the bars, what does this do for you, increase grip strength or forearms? I personally have never seen this

If it was the fat gripz then from what I've seen I believe it makes it a fatter bar so it helps in grip strength as well as helping keep the forearms tight

It looked like two cleaning sponges in his hands, but I wasn't sure. If I could figure out how to post a damn vid I would post it, I did it once and can't figure it out again, I try going to the embed code but it doesn't do right.

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Figured it out haha

i have seen people use sponge like things before.

I've also seen guys use tennis balls for pullups and pulldowns for added grip strength

better grip if they cant use chalk

seen plenty of guys doing it just thought they where strange.guess not ..my bad..live en learn..