Mainstream Movement Instructions
Name:  Centers IN
Starting Formation:  Whenever there is a couple with their backs to the center of the set facing or standing behind another couple (e.g. eight chain thru, completed double pass thru).
TIMING:  2
The outside dancers step apart as the centers step forward and between them to form a line.
STYLING:  The active couple should use couple handhold and, if stepping in between couples facing the same direction, join hands in a line of four. If the active couple steps in between a couple facing in the opposite direction, use hands-up position with the end dancers.