Kate Middleton is one of the most beautiful members of the royal family. And she’s also one of the fittest and healthiest British royals.

According to In Touch Weekly, Prince William’s wife has a ton of fitness secrets that not everyone knows of. For instance, Middleton has a competitive streak and this helped her become as fit as ever.

“She’s a total sports addict and has been her whole life. She’s always up for a game. Kate manages to stay in fantastic shape – I’ve never met anyone as self-disciplined. She’s developed a grueling fitness schedule that she swears by,” the source said.

The insider also claimed that some of the things that Middleton swears include developing a grueling fitness schedule, which includes tailoring your own fitness routine, committing to daily workouts, getting outside whenever possible, choosing mindful exercises, and maintaining a balanced diet.

Since the Duchess of Cambridge is already a pro at working out, her biggest secret is that she no longer works with a personal trainer.

“You don’t need a personal trainer to stay in shape. After years of studying the benefits of exercise and the most effective workouts, she has the confidence to do it on her own. Kate is the first to admit that she feels lethargic if she doesn’t get up and move at last once during the day even if it’s just to take a brisk walk,” the source said.

One of Middleton’s favorite activities is rowing on the River Thames, which works wonders on her arms, legs, and stomach. She also loves running and being outside even when it’s raining hard.

On Thursdays, the mom of three heads to the tennis court to play her favorite sport.

“It’s her favorite day. Tennis is definitely her main sport. She’ll organize a game with William. Finally, on Fridays, Kate winds down with yoga. Kate believes mindful exercise is so fulfilling. Obviously, Kate also sticks to a healthy, balanced diet – everything in moderation – but exercise is most important for her. Maintaining her fitness routine not only keeps her toned but also helps with her mental health and productivity. She simply wouldn’t be herself without it,” the source said.

However, Middleton has never talked about her workout and fitness routine extensively. So, it’s obvious that the tabloid is just speculating on what she has been doing.