Developing clean even doubles are demonstrated at slow, moderate and fast tempos. This is played in duple and triple feel. This allows you to look at doubles from two perspectives. It also gives you greater control and leverage commanding everything in duple and triple feel. I begin with a warm up I typically use that employs doubles. This helps loosen the wrists before performing which also gives me greater control and longevity in the long run. I recently attached the PDF file “Doubles 2” to this lesson months after the original post because I repeated this lesson again in Doubles 2. Basically Doubles 1 and Doubles 2 are the same lesson but from different perspectives and approaches.