Jack LaLanne was able to do fingertip push-ups well into his 90s. Never heard of him? If you struggle to the gym before or after work you can thank him because he founded the modern fitness movement in the 1930s, when lifting weights was considered weird (some still do consider it weird…). In 1951 he was given his own TV show in the US, The Jack LaLanne Show, in which he encouraged viewers to get fit by using a series of household props. His TV show continued for 30-odd years and 3,000 episodes but he still found time to invent a fitness machine, promote a juicer and sell fitness DVDs and books.
Read more about him in The Economist