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Everyone [knows / knowing] how to find the age of a fallen tree. We count the number of rings on the tree's [stamp / stump] . A scientist has found a new way to measure the age [of / to] people – get them to stand on one leg. Dr Kenton Kaufman from the Mayo Clinic [in / on] the USA said standing on one leg shows how [good / well] a person can balance. He said balance becomes more [difficult / difficulty] as we age. Dr Kaufman added: "Balance is an [important / importance] measure because, in addition to muscle strength, it requires input from [visits / vision] , the hearing system, and the senses." He added: "Good balance provides the ability to carry [in / out] activities of daily living without the fear of falling, and this leads to improved quality [at / of] life and healthy ageing."

Forty people over the age of 50 [gave / took] part in the research. They did tests for walking, balance, grip, and [kneel / knee] strength. Each participant had to balance on [their / there] dominant and non-dominant leg for 30 seconds. They [did / had] this with their eyes closed, and again with their eyes [open / closed] . Kaufman found that standing on the non-dominant leg [shown / showed] the highest rate of decline with age. There was a 2.2-second-per-decade decline when [participates / participants] stood on their non-dominant leg. This compared to 1.7 seconds for the dominant leg. Kaufman [concluding / concluded] : "Standing on one leg is a good measure of [their / your] overall health because balance reflects [how / what] the body's systems are working together."