America has given birth to a new breed of super-fit pensioner. In Oakmont Village, California, the senior residents are doing everything they can to live long and healthy lives. What happens when four young, unfit and unhealthy Brits are sent to live with some of the fittest pensioners in the world? 25-year-old lazy Welsh socialite Ashlei Swain, 20-year-old bone-idle punk student Jennifer Lovell, 22-year-old fried food lover Nicole Pereira and 18-year-old chain smoker Ben Katchi are about to meet their fate. For a week they must stay with 68-year-old Bev Levy and her 71-year-old husband Ron, and 77-year-olds Carol and Jim Cotton. The hosts might be in their retirement years but all four are fitness fanatics. From competitive swimming to yoga and daily gym workouts, they look forward to whipping the young Brits into shape. In a life-changing week, the Brits are forced to quit their usual lazy lifestyles and exercise to the max. They swap burgers and sweeties for a healthy diet and are pushed to their physical and emotional limits. At the end of the week they face the ultimate battle of the ages when they take on four golden oldies in a cycling relay race, to find out if they really are fitter than a pensioner. Can stroppy rebel Ashlei conform to the strict regime? Is punk rocker Jen able to conquer her fear of exercise? And how do the Brits fare in the big race - are they victorious or do they suffer defeat at the hands of super-fit pensioners?