1966: On 16 July, Mao Zedong swam several kilometres down the Yangtze at Wuhan to demonstrate that, at 72, he retained his vigour. Mao was a keen swimmer, unlike his wife Jiang Qing, who never learned to swim. At the seaside, Jiang wore rubber shoes even when she paddled in the shallows, to conceal a sixth toe on her right foot.
Source: Li Zhisui, The Private Life of Chairman Mao: The Inside Story of the Man Who Made Modern China (1994), pp. 175, 463