There is one simple piece of equipment that if you don't already have laying around in the garage or shed, you can probably cobble together with what you do have and some duct tape.

Hammer levering is the little-known, little-used secret to increasing wrist and forearm strength. Besides giving you the ability to do incredible performance feats of strength, levering allows you to train unused and underused ranges of motion in your grip work. If you've been paying attention, you'll already know that one of the secrets to faster progress is training those movements you don't get enough of.

The best part is, you almost certainly have something in your garage that you can use to perform these exercises. Click through to the video to learn the key lifts that you haven't been doing in your grip training.