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WATCH: Princess Kate and Prince William go head-to-head at spin class race during trip to Wales

William was huffing and puffing by the end of it!

Princess Kate and Prince William had a royal race during their trip to Wales, battling it out on stationary bikes at a spin class.

With Kate in heels plus a midi skirt and William in a suit, neither were in the appropriate attire for the occasion, with Kate saying so as she entered.

"Not sure I am dressed for this," she said, as reported by the BBC.

Both gave it their all as the rest of the spin class cheered them on, but it was the Princess who ended up coming out on top of the 45-second duel and was even given a trophy for her efforts.

William was huffing and puffing by the end of it, telling the instructor he needed some rest before continuing the conversation.

"Talk to you in a minute," he said.

The high-paced duel took place at Brynawel Rehabilitation Centre, near Pontyclun, Rhondda Cynon Taf in Wales, which provides mental health support for those struggling with alcohol and drug dependencies. While there, the Prince and Princess debuted some therapy gardens and allotments.

The two seemed to have a ball of a time in the gardens, with William laughing at the sight of 'Sweet William' seeds. Princess Kate would go on to plant some of those seeds before being gifted daffodils by two-year-old Cora Phillps.

Michelle Phillips, Cora's mother, just so happened to be visiting the gardens at the same time as the royal couple and was shocked at the chance encounter.

"Oh my goodness," she said. "I did not expect that in a million years."

The chief executive of the Royal Foundation, Amanda Berry, said that the royal family plans to carry on supporting mental health in the future.

"Their Royal Highnesses continue to prioritise our society's mental health and spending time in nature is known to have a range of benefits, including reducing depression and anxiety," she said.