The Bas Rutten workout CDs are an excellent way of exercising combination punches and creating muscle memory. I have been fortunate to study the CDs from Bas Rutten himself and his instructors Randy Khatami, Amir Rahnavardi, Hector Pena, Art Rivas, and James Singler. They have all demonstrated and introduced a variety of different ways that the CDs can be used and tweaked in a workout routine. Using the CD with the double end bag improves hand/eye coordination.