I dont know about the stretch thing mentioned by skyhawkdrummer but I found that letting the elbow rock back and forth allows the stick to reach a greater angle and to answer an earlier q, 2-3 inches is good distance between body and elbow because itll give your elbow room to move, if your elbow is jammed into your body it restricts your rotation and causes an inward slice and keeping it too far away also restricts the rotation.
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Newsome High School
2006-2010 Snare
2008-2010 Center Snare, Drumline Captain