This story is part of a package on "Growing old healthily." The introduction is here
Shoko Yonezawa is surprisingly matter-of-fact about being a multiple world champion.
The 71-year-old housewife and grandmother from Yokohama laughs merrily as she admits that the best part of her twice-weekly visits to her local swimming pool are actually the many breaks that she enjoys taking from swimming to soak in a Jacuzzi and chat with friends she's made there.