Classes of Shifts
Shifting from an open string to any note.
Shifting on same finger ex. 1-1.
Shifting from a low finger# to a higher finger # going up, or vice versa when downshifting. This may be trained by an exercise like 1-1-3
Class 4 (Compression shifts)
Start on higher finger # going to lower finger #. ex. 3-1. Slide on the transport finger
Extension shifts-hand is more than one position at the same time.