They might be on their Christmas holidays, but that doesn't mean Princess Mary and Prince Frederik aren't keeping on top of their fitness goals.

Proving they're an inspiration for the rest of us as 2017 edges to a close, the Danish Royals were pictured enjoying a morning run together on Sydney's Palm Beach.

For the cloudy but warm Friday morning, Princess Mary sported a V-neck blue T-shirt by Nike, a pale blue cap by Under Armour, Nike navy shorts and bright-coloured trainers.

Princess Mary and Prince Frederik enjoyed a morning run along Sydney's Palm Beach (pictured) on Friday

For the cloudy but warm Friday morning, Princess Mary sported a V-neck blue T-shirt by Nike, a pale blue cap by Under Armour, Nike navy shorts and bright-coloured trainers (pictured)

The 45-year-old mother-of-four carried a bottle of water (pictured) as she warmed up and prepared for the jog along the beach

The pair are clearly keeping on top of their fitness goals, even though they are on holiday in Australia for the festive period (pictured on the run)

Her husband, Prince Frederik, meanwhile, opted for a checked pair of shorts, a neutral-coloured baseball cap and white T-shirt.

He also wore bright trainers as the pair made their way along the water's edge, and the 2.3 kilometre stretch.

Sydney's Palm Beach - affectionately known as 'Palmy' - is an iconic site located to the north of the city.

It is famously known as the set for the popular Australian soap, Home & Away.

The beach itself lies at the end of a long peninsula, fringed by surf on one side and the tranquil area of Pittwater on the other.

Sydney's Palm Beach - affectionately known as 'Palmy' - is an iconic site known as the set of Australian soap, Home & Away (Mary pictured on the beach)

The beach itself lies at the end of a long peninsula, fringed by surf on one side and the tranquil area of Pittwater on the other (pictured)

Her husband, Prince Frederik, meanwhile, opted for a checked pair of shorts, neutral-coloured cap and white T-shirt (pictured with Princess Mary)

Princess Mary, Prince Frederik and their family touched down in Sydney last week to enjoy an Australian Christmas for the first time in years.

After taking part in a yacht race on Sydney harbour mere hours after their arrival, the family have kept busy.

According to the Daily Telegraph, it's rumoured that Prince Frederik could be planning to compete in the inaugural Sydney to Hobart race on the vessel, which kicks off on Boxing Day.

They also enjoyed a beach day later after the run, again at Palm Beach on Friday, complete with body boards, swimming and beach football.

Since the pair touched down in Australia last Tuesday, they have been keeping busy - and even took part in a yacht race

The Australian-born princess and her husband arrived with their four children ahead of a planned holiday with Mary's family (pictured on the beach)

The Australian-born Princess and her husband arrived with their four children ahead of a planned holiday with Mary's family.

'The Crown Prince couple travel together with their four children, TRH Prince Christian, Princess Isabella, Prince Vincent and Princess Josephine, to Australia and celebrate Christmas with the family of HRH The Crown Princess,' a statement from the palace read.

Princess Mary visited Australia with her family in 2015, as well as with Prince Frederik in 2013, but did not travel to Tasmania, Mary's hometown, on either trip.

The royal family's previous vacation in Australia garnered numerous headlines as they visited the likes of Perth, the Gold Coast, and Byron Bay.

'The Crown Prince couple travel together with their four children, TRH Prince Christian, Princess Isabella, Prince Vincent and Princess Josephine, to Australia and celebrate Christmas with the family of HRH The Crown Princess,' a statement from the palace read (Mary pictured)

However, it is Frederik who has been in Australia more recently, having attended Audi Hamilton Island Race Week in August.

Unfortunately, Princess Mary was unable to make it thanks to commitments at home.

'She would love to be here,' Prince Frederik told Channel 7 at the time.