Manypeoplehurttheirb的精選

問題詳情：Manypeoplehurttheirbackswhentheytrytoliftheavythingsfromthefloor.Itiseasytohurtyourbackmuscle(肌肉)whenyoutrytopickupaheavything.However,thereisacorrectwaytoliftthingsfromthefloor.Ifyoupickuph...