He bent over this morning to pick something up and heard a small pop in his lower back.
['bent', 'over']
['He', 'bent', 'over', 'this', 'morning', 'to', 'pick', 'something', 'up', 'and', 'heard', 'a', 'small', 'pop', 'in', 'his', 'lower', 'back.']