Now I know why the Japanese and Chinese are thin – it’s not the diet.  They get lots of exercise by LAP SWIMMING.

From:  amusingplanet.com

“Crowded pools are also common in Japan. National Geographic photographer Michael Yamashita, who captured pictures of a typical summer day at one of the largest waterpark, the Tokyo Summerland, told My Modern Met:
It seems a number of viewers are horrified, appalled, nauseated and generally grossed out by the sheer number of swimmers squeezed into these mega-pools.”

There’s no question that given the heat, humidity and population of

Tokyo in the summer, the throngs at any swimming pool there are going to, by definition, test the limits of crowd control and sanitation. Japan, however, is prepared for this and manages to keep everyone happy and cool no matter how jam-packed the pool – by moving the water rather than the swimmers. While not exactly conducive to laps, giant wave pools surge with swells a meter or higher, drenching stationary bathers so they don’t need to swim to cool off.

Other pools feature circular courses with a current that keeps everyone moving together in the same, very orderly, direction. And of course, Japanese people, by tradition and habit, are arguably the cleanest – not to mention the most cleanliness-conscious – in the world. The water in these pools is clean enough to drink!”

“Yeah, right!
Keep this in mind: if you are visiting China or Japan, stay out of public pools.”