It's long been obvious that exercise and playing sports significantly extends life and improves health over those who are sedentary.
But the research is now overwhelming that tennis is the best sport to play to maximize those benefits, as NYT documents.
https://t.co/WxWOfXCejC
Also, professional tennis players are clearly the world's greatest athletes. They play alone, up to 5 hours, traveling the world, combining extreme skill and mental focus and the highest possible levels of fitness.
Look at this from a recent match: