These are basic technical exercises I use with my high school drumline EVERYDAY. Good technique is essential to playing in time and playing in time is essential to playing well. These also work well for older middle school percussionists as well to further solidify technique learned as a beginner. I also use exercises from this when holding drumline auditions.
The first three exercises work the 4 basic stroke types; full strokes, down strokes, up stokes, and tap strokes. AB Double-Beat strengthens chops and helps double stroke rolls. The remaining exercises are essential timing exercises.