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Up for sale is a Gripzilla Dynamo in new condition. I purchased this a few weeks back and still have the bag it came with. This is an excellent tool to help build or rehab your forearms. This has helped my grip and manage my tennis elbow. Retail is $159.

From their website:

Do your forearms fatigue too quickly during training? Is wrist pain causing you to cut workouts short? Do you avoid certain exercises because your grip isn’t strong enough?

Gripzilla Dynamo targets these issues by strengthening your wrists and forearms, giving you the power and strength you need.

How To Use Gripzilla Dynamo?

To use Dynamo, grip the device firmly and perform controlled wrist rotations, curls, or flexion exercises. Start with light resistance, gradually increasing as your strength improves.

This helps build muscle endurance, improve grip strength, and alleviate wrist pain, making it an essential arm training tool for both rehabilitation and performance enhancement.