The small of the back exercises a method is: Sit-ups, do 6 - 8. The attention when doing holds out pectoral straight waist.是什么意思_The small of the back exercises a method is: Sit-ups, do 6 - 8. The attention when doing holds out pectoral straight waist.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句