Cello Power is a series of technique books by Marion Feldman designed to be used to expand the studentÂ's facility and knowledge of the instrument. Cello Power Book 2: Cello Warm-ups in Thumb Position includes exercise warm-ups by Libby Freidman and related repertoire materials by Breval, Locatelli, Goltermann, and etude excerpts by Popper, Grutzmacher, and Piatti. Exercises in this book include thumb position scales, thumb position arpeggios, long shifts in thirds, octaves, and sixths, and diminished chord patterns.