Next time you spot a little old lady using a cane to walk down the street, watch out. She may be an expert in martial arts. Some seniors in San Antonio are learning to defend themselves using canes.

ZEPHYRHILLS, Fla. — Pay no mind to the groans that come with stretching, to hair that is gray or gone altogether. Ignore the cautiousness of their steps and the canes in their hands. These seniors are ...