High intensity interval workouts bring more health benefits for older adults than steady moderate exercise, according to a new study. The findings contradict a widespread belief that frailty that increases with age justifies a gentler approach. Published in the Journals of Gerontology, the study looked at the impact on 68 people between the ages of 66 and 79 – who did not exercise regularly – of twice weekly sessions over three months on stationary bicycles. Half of them pedalled at a constant speed. The others did six second sprints with a total workout time of 20 minutes. Although the former group exercised for twice as long in total, the high intensity participants saw more significant improvements in cardiorespiratory firtness, muscle function and memory.