Amanda Holden often shares photos of herself exercising, whether it's out on a run, on a bike ride or doing a home workout with her daughters Hollie and Lexi, and in a new interview she revealed her biggest motivator for keeping fit.MORE: Amanda Holden looks unreal in bikini photo – here's how she stays in shapeSpeaking to journalist Suzanne Baum for Top Sante magazine, Britain's Got Talent judge Amanda explained that she exercises to offset the alcohol she drinks.WATCH: Amanda Holden's 7 best