I've never worked in that area myself but friends have....

basically it could be a mixed bag of outpatients (pregnant women and new mums with back pain, Wikipedia reference-linkSIJ pain etc), maternity unit- going around the ward giving mums advice on abdominal and pelvic floor exercises, antenatal- advice and education on posture, lifting, exercises to protect the back...more abdominal exercises etc!! I guess you may also come across women with continence problems and will probably have to advise on exercises etc....I guess its a more musculoskeletal type of placement

Hope that helps!