He said: “The Duchess of Cambridge, Kate Middleton, has a slender and athletic physique which is most likely shaped by doing resistance-based gym workouts primarily focusing on strength training using bodyweight and weights.
“In addition, she’s an outdoorsy person and has been known to enjoy running, skiing and tennis, it wouldn’t surprise me if on average her run was 10km or above.
“As it is known Princess Eugenie has experienced her own transformational fitness journey.
“With a combination of a healthy diet, it’s very likely her exercise regime consists of HIIT (high intensity interval training) doing circuits with a mixture of bodyweight cardio exercises such as jump squats, burpees, high knees and lunges.
source: express.co.uk