[annikan skywalker]

Great effort Yipped....We'll go through it slowly

The Pelvis is rotated forward at address...with flexion at both hips and a very slight extension of the tailbone and lower portion of the lumbar....With minimal to no lateral flexion and rotation due to a squared away body alignment at address...

In the backstroke..the pelvis rotates clockwise with internal rotation at the right hip and external rotation at the left hip depending on the pivot style (slide versus shiftless) would determine the amount of lateral flexion at each hip joint thus affecting greatly the hip slant...Note: also the amount of backstoke hip slide and/or change in leg action would also cause a slight abduction at the left hip with perhaps a very slight increase in flexion ans a slight adduction and slight movement toward extension in the right hip joint

Downstroke the pelvis is rotating counter-clockwise and the opposite motions and rotation at each hip joint will take place and also moving with some degree of translation due to hip slide thus causing an overall Axis Tilt...to set in..

During the Follow Through and Finsh there is both the continual rotation counter-clockwise of the pelvis and internal rotation at the left hip and some internal rotation at the right hip at and extension of the pelvis and both of the hip joints resulting from the degree of hip slide caused by translation all causing the Torso to move up and back toward a neutral alignment for the Finish....

woah...that's just a very basic description of the pelvis....