HUBUNGAN BEBERAPA KARAKTERISTIK IBU HAMIL DENGAN TINGKAT KEIKUTSERTAAN SENAM HAMIL DI RSUP.DR.SARDJITO YOGYAKARTATHE CORRE LATION BETWEEN PREGANT WOMEN CHARACTERISTICS WITH THEIR PARTICIPATION LEVEL ON PREGNANCY EXERCISE PROGRAMME AT RSUP.DR.SARDJITO YOGYAKARTA - SULISTYORINI, EVI (2005)