Hello all. I don’t know the names of these two things or if they’re still made, but I remember my dad having some back in the 80’s.
One is basically a long bar that is one thick metal spring with two handles on the ends. You bend the bar, moving the handles towards each other. That’s it.
The other thing is also two handles but with a few coiled springs in between. You pull it apart, and I guess it mimics pulling back a bow string. I’d like to get these if they still exist. Thanks.
First one is a Bullworker.
Misread the description. Never mind.
Well my grandpappy used to say, “Son, use your very limited abilities for the benefit of mankind, if you can possibly dream up a way.”
Awesome, thanks. Just what I was looking for.
Just FYI - that second link also opens the Power Twister search.
Odd, it’s working OK for me. 
When I was a kid in the '60’s, we had one of those Chest Expanders lying around the house that looked as though it dated from the Pleistocene. Turns out that Stanislaus Zbyszkoused one of these around the turn of the century, if not earlier. This was long before gravity was invented, so you can’t really blame him.
Now that they even have gravity in China, where everything is manufactured, you can get one of these really cheaply, like $10 on eBay. Back in the Pleistocene we had to pay more than that for a rock. Then came the work of chiseling the rock into the shape of a spring, finding another rock when the first one didn’t work, etc…
Anyway, you’re welcome. 
No Indian clubs?
I’d like to point out that I think it’s awesome that the medicine ball is seeing a resurgence of popularity in the modern gym.
From an episode of Mad About You:
Paul: You’re throwing out my Bullworker?
Jamie: You never even took it out of the box.
Paul: I know. Sadly, I’m not strong enough to open the box.
Later in the show Jamie cheers him on:
Jamie: Paul, Paul, he’s our man If he can’t do it, no one can
Paul: I can’t open this box.
Jamie: Paul, Paul, he’s our man If he can’t do it, no one can
Paul: It won’t open!
