This is the CRUX: an infinity rope trainer with adjustable resistance that helps you build muscles and test your endurance. You can attach this to a variety of training frames. The CRUX has easily adjustable resistance. It can be used for standing crunches, seated pulls, and other functional moves.
More gadgets like this ➡️ : here
The CRUX can be used to build explosive at lower resistance. The above video shows what you can do with it.
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