One of the first rudiments learned by any drummer is the double stroke roll. The double stroke roll works just like the single stroke roll, but it’s played in a sequence of alternating strokes. Instead of having one stroke per hand you’ll have two. When played properly the two strokes can be made to sound identical. This produces a near-continuous sound when the technique is mastered.
Doubles are extremely useful. Isolated double strokes can be played around the drum set. In addition to those obvious applications, being able to play a good-quality double stroke roll will likely improve your drumming in ways you wouldn’t expect. I’m still working on my double stroke roll to this day. I’ve spent countless hours working it out on the pad while trying to produce as consistent a rebound as possible. Below are some exercises to help you improve your double stroke roll (Click image for full size):