This 47-Year-Old Celebrity Easily Has the Hottest Bikini Bod on the Beach

Britney Spears likes her workouts intense, but also short. “I like my workouts to be effective in a short amount of time,” she told US Weekly. “I start with 20 minutes of intense cardio — usually running — move on to light free weights; body-weight exercises such as push-ups, squats and situps; then finish it …