What does grip training work anyways?(besides grip)

[squats3xWeek]

Does it strengthen the inside part of the forearm? Or does it strengthen the joints used in the fingers?

I've been doing static holds with the bar lately and am wondering what causes someone to have strong grip. The hand? Or the forearms.

 

[ExtraMile]

Depends what exercises you are doing for grip. Some grip exercises work lower body, traps, upper back, abs etc.

Yes static holds will strengthen both your hands and forearms.