Manypeoplehurttheirb的精选

问题详情：Manypeoplehurttheirbackswhentheytrytoliftheavythingsfromthefloor.Itiseasytohurtyourbackmuscle(肌肉)whenyoutrytopickupaheavything.However,thereisacorrectwaytoliftthingsfromthefloor.Ifyoupickuph...