Here is an exercise I have been shedding a lot lately. This is designed to help build speed, control and endurance. Start by playing each line twice. Then progress to playing each line 4 and 8 times each. Start at a slow tempo and move slowly up to the faster tempos. Record your max tempos. Endurance is key, so play each one as long as you can.
Ryan Carver is a professional musician and educator based in New Jersey, USA. Find him online here.