Staying fit and healthy is a priority for many individuals, and age is no obstacle for these celebrities in their 40s. From Britney Spears' fierce dedication to dance to Charlize Theron's workout routine, these stars are setting an inspiring example of how to maintain a fit and active lifestyle well into their forties. Let's take a glimpse into the fitness regimes of some renowned personalities and see how they are redefining what it means to be fit in your 40s.