The most impressive part? He performed the moves while wearing white jeans.
Apparently royals have no fear of grass stains.
What was all that stretching for? William and his brother, Prince Harry, didn't just show up to the event -- they took the field as well.
Harry didn't get limber with his big brother and the other polo competitors -- nor did he play soccer with them later -- but he did look quite cool standing on the sidelines in a light blue button-down, jeans and sunglasses. He reportedly did stretch at some point in the afternoon, however, and was seen by a physiotherapist, as he hurt his back after a fall during the event last year.
The brothers will play in matches throughout the summer in support of charities, including Tusk and Sentebale, a wildlife organization that Prince Harry founded to help children in Lesotho.
If you want to feel bad about your own exercise habits, do stare at these photos of William for a little while longer. But then remember that Harry did not join in, and feel a little bit better. Or worse. He seems to have participated in a polo match without stretching…
William's wife is no slouch in the workout department, either. Kate looked totally badass during a charity sailing event on England's America's Cup yacht last week.
Last month, the pair took a five-hour hike up to a monastery during their royal tour of India and Bhutan, and neither looked like they even broke a sweat. Try to put your jealousy aside while watching the video of the royal couple below.