Battle of the biceps! Prince William, Princess Kate & more impressive muscles

Spain's Queen Letizia is reportedly a huge fan of Iyengar yoga – and it shows! The yoga form focuses on the structural alignment of the physical body through the practice of asanas (postures). 

It sees yogis hold poses for longer, which in turn helps to build strength and flexibility. Beyond this, it's thought that the mother-of-two has a personal trainer and enjoys running and working out with weights.

Prince Harry's muscular biceps are no doubt a result of his rigorous training whilst in the British Army. He entered the British Royal Army in 2005 and served his country for ten years before leaving in 2015. 

During his career, he completed two tours of Afghanistan, qualified as an Apache Aircraft Commander and spearheaded the Invictus Games. His biceps were clearly visible back in June 2014 after playing in the Jerudong Trophy charity polo match at Cirencester Park Polo Club.

The Princess of Wales is renowned for her love of sports, especially tennis, sailing and rowing. She's never afraid to get stuck in and has previously taken part in an array of athletic activities alongside Prince William including land yachting, spinning, rugby, archery and skiing. 

Sharing a glimpse inside Kate's fitness regime, former rugby ace Mike Tindall previously described the royal as an "engine" before adding that "she loves running, she can run all day!" In June last year, Kate took part in drills during her visit to Maidenhead Rugby Club – and her biceps were truly 'bicep-ing'.

Princess Charlene of Monaco enjoyed a successful career as an Olympic swimmer before hanging up her goggles and cap in 2007. During her impressive career, she represented South Africa at the 2000 Sydney Games, with her team clinching fifth place in the 4 x 100-metre medley relay. 

While her swimming days may be firmly behind her, the mother-of-two has maintained her sculpted physique and impressed royal fans back in 2019 when she displayed her enviable biceps during the F1 Grand Prix of Monaco.

It's thought that Mary enjoys running, walking and horse riding. According to New Idea, her sister-in-law Leanne Donaldson previously revealed: "Mary, like the rest of her family, is totally dedicated to exercise. She's always walking, jogging, or riding a horse." 

In 2019, Mary looked particularly toned as she stepped out to attend Princess Benedikte of Denmark's 75th birthday party hosted by Queen Margrethe of Denmark.

As a former professional rugby player, Mike Tindall is certainly up there with some of the most athletic royals. Aside from playing rugby, Zara Tindall's husband is also a huge fan of golf and enjoys running with his daughter Lena.

Meanwhile, in 2022, he embarked on a 770 km-long bike ride from Lake Geneva to Antibes to raise money for Cure Parkinson's.  

The Prince of Wales left royal fans 'blushing' back in 2021 when he received his first dose of the COVID-19 vaccination. Reacting to a snapshot shared to X, one wrote: "Those guns tho!!" while a second noted: "Prince William has some guns…" 

Prince William's athletic physique can likely be credited to his years in the Armed Forces. He served in the Army as a Platoon Commander in the Blues and Royals, before later completing flying training in the Royal Air Force and serving as an RAF Search and Rescue pilot.