Do those finger exerciser's really work?

[BigBadWolf1171]

Id say its really not about finger strength,unless you have overly weak hands.it doesnt take but a lite touch to push a string down.ive been powerlifting for the better part of 23 years and it had totally worked against playing guitar. i have average length fingers but the years of lifting have made my hands thick enough that xxl gloves are required for them (i have to cut 3/4 inch off the ends of the fingers).its made gripping the neck harder from thumb joint thickness, to having to really arch my hand over the strings from upper palm and finger thickness. And yet my forearm will still get sore if i play for a few hours. In my opinion,just playing the guitar is the best excerise there is.

[Plank_Spanker]

Finger strength really isn't an issue with guitars.....unless you're trying to fret a dobro.

Stamina is the issue. Can you fly around the fretboard at will for several hours without feeling fatigued? The only way to build that up is to play to that level regularly. If I slacked off for a week or two and then played a gig, I could feel it - I could still move, but my hand was feeling tired by the end of the gig. When I stay in good playing shape, my hand is as fresh at the end of the night as it was when I started.