Here's a challenging independence exercise that also sounds musical. It's a sixteenth note paradiddle between the snare and kick drum where the right hand is replaced by the kick drum - KLKKLKLL - That frees the right hand--which is playing every third sixteenth note on the cymbal stack (dotted 8th notes). The icing on the cake is adding eighth notes with the hi-hat pedal. However, since the pattern is rather busy I decided not to include the hi-hat foot in the notation. davidoromaner.com