Quick take: A non-camera one from the early days of the channel. The LOVHO adjustable arm exerciser (sold as a power twister) claims 10 to 150 kg of adjustable resistance, and at the higher settings it's brutally hard. It hits your grip, forearms, chest and shoulders. For about $70 at the time, I thought it was a good value, with one catch: there's no resistance on the way back out.
What It Is
A friend and I like to play around with grip tools, like high-tension wrist rollers and twisters, that build grip strength, forearms and the small tendons in your hands. He found this one on Amazon after falling down a grip-training rabbit hole. It's an adjustable arm strength machine that you squeeze together, with a dial that sets the tension. It looks a lot bigger in person than it does in the ad photos, and it seems well made. The only thing in the box is the tool itself.
I was curious whether it would carry over to bending steel rods, something I'd tried before, and to gripping stones in strongman.
Working Up the Settings
At the lowest setting, which I'd guess is the 10 kg mark, it's manageable. At 3 the tension is definitely dialed up, and it gives a very different kind of chest stimulation, like very targeted flies. At 5 it starts getting difficult. At 7 it's exponentially harder, and my shoulders were on fire after a single rep. At 8 it felt much tighter than the one my friend has.
The dial keeps turning up to 12 and beyond, then wraps back to zero. At 12 it barely moves at all.
The Catch: No Eccentric
The resistance only works when you're closing it, a bit like garden shears. There's no push or resistance on the way back out, so you don't get any eccentric work. My guess is it uses something like an adjustable hydraulic shock.
Verdict
If you went down the same rabbit hole and wondered what this thing is, it's the LOVHO arm exerciser, and I'd recommend it. It's not bad at all, especially for the price.
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