First, disclaimer: all opinions/intuitions, no science. It seems to me that, like all other categories of strength, there's a difference between max grip strength (how much can you hold) vs grip endurance (how long can you hold). Most of the popular grip training modalities (KBs, hanging, carrying) seem geared towards endurance - sure, they'll build max strength too, but sort of in the way that high-rep pushups builds max press strength, I would call it "indirect". How might you train to focus on max grip strength? There's the obvious answer of some variety of heavy deadlift, maybe with limiting the range to allow more weight. Maybe overspeed KB eccentrics? But in particular I'm interested in modalities that wouldn't tax the back, since my back pays enough taxes as it is. Are grippers (e.g. "Captains of Crush") good ways to develop max grip strength?