Sit down on the floor and get back up again using no support
Believe it or not, your ability to do this can tell you how long you’re going to live. In 2012, Brazilian researchers tested 2000 middle-aged and older men and women, and it’s all down to muscle strength, flexibility and coordination. Starting with a score of 10, you lose one point for every body part you use (hands, knees, arms) and half a point for wobbling. A score of 8-10 means you may live to see 100; 3.5-5.5 means your final curtain call might be earlier. But don’t despair – you can improve your score with practice, and therefore add some years back on.