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Considering this, what muscles do hand grips work?
Gripping involves opening and closing your wrists which in essence means that you engage your forearm flexors, as well as forearm extensors. Working on your hand strength strengthens and bulks up these muscles, giving your arms a powerful appearance.
Hereof, do hand grips do anything?
The short answer is yes, they definitely do. If you are looking to build a stronger grip and better finger strength, then a grip strengthener might be just what you need in order to do so. As the hand grippers work to improve the strength of individual fingers, it also increases your dexterity over time.
You can't increase the size of your wrists- you can certainly strengthen and tone them but they aren't going to get to get bigger. That being said I consider hand grippers as more of a gimmick than anything else.