The Duchess of Cambridge, Kate Middleton, rarely appears in sleeveless dresses because her wardrobe generally consists of classic dresses and coats, covering all or part of her arms. But on the last tour in the Caribbean - where temperatures are high - Dukesha showed toned muscles.

If you are curious about the Duchess's training routine, here is what you need to know:

1. Fan of cardio exercises: Duchess loves cardio exercises, especially running.

2. Prefers plank: Kate greatly prefers plank exercises that tighten muscles. More precisely, she practices the basic, lateral and "skydive property" plank. Kate can stand for up to 45 seconds and repeat the exercises at least 10 times each.

3. Likes CrossFit: CrossFit includes endurance exercise, weight training, jogging, and squats, and can improve health, performance, increase muscle endurance, and help with weight loss. Her favorite for toned bellies is the gym ball.

4. Sports: Other activities in Kate's routine include walking, skiing, jumping, tennis.