Want to spice up your arm workouts? This is the tool to do it with.

It gives you a unique extra stimulus on your forearms during a curl, thanks to the chain that wraps around the wheel.

The chain will actively try to open up your wrist during the curl. To fight this from happening, your forearm muscles will have to stabilize your wrists, which will give you a crazy contraction that you won't feel during a regular curl.