There are a few different ways that you can use a double D handle. The most common way is to grip the handle in your dominant hand with your fingers wrapped around the top part of the D. Your other hand should be gripping the bottom part of the D. You can also grip it with both hands, one on each side of the handle. Another way to use it is to place your dominant hand in the middle of the two Ds and your other hand on top of that one.