Anyone Else Do Hand Exercises?

I've been playing fretted instruments for longer than I can remember. Performing hand exercises precedes my time throwing, but I still think it's worth mentioning. I have one of these. Specifically this 7 lb resistance one. This resistance level feels like it's been providing me a decent challenge, that I can also do while binge watching a show or wtvr. I enjoy how you can strengthen your individual digits, and you can go from fingertips to any of your phalanges easily. You can even remove the black palm-shaped piece and use it on a flat surface.

inb4 "screw off you corporate shill" :P

Does anyone else do any sort of general hand exercises? Or perhaps pre-throw warm-ups?