MOST people go on a cruise to relax, lie on a sun lounger and enjoy some pina coladas as they sail from one destination to the next.

But my has a legend on board who is intent on putting guests through their paces.

Shirley Ballas in a pink suit posing on a staircase on a cruise ship.Strictly legend Shirley Ballas puts guests through their paces Credit: Supplied A long, colorful digital ceiling displaying mandala-like patterns and circles in pink, purple, blue, and gold, above a cruise ship's grand promenade featuring a restaurant, shops, and lounge areas.The Galleria Virtuosa is the vast promenade onboard with the longest LED dome at sea Credit: Ivan Sarfatti

Enter , head judge of BBC’s , who has been invited to run a masterclass on the jive.

At a diminutive 5ft 2in, Shirley’s stature might be small, but she takes no prisoners as she issues loud, stern instructions: “STEP, TWIST, SWIVEL, KICK, AGAIN!”.

This is day two of a seven-night Norwegian fjords voyage round-trip from on MSC Cruises’ 19-deck, 6,300- passenger ship, the MSC Virtuosa.

Shirley is scheduled to host several activities during the sailing, but for now the focus is on the jive, which is taking place somewhere in the North Sea.

More than a hundred of us have turned up and it’s proving tricky. As if the shimmies, chasses and spins weren’t enough, the music then speeds up. I’m as coordinated as a two-legged spider.

Think right foot instead of left; arms up instead of down. I’m confident with the kick, but then a fellow passenger whispers in my ear: “If you point your toes it will look more elegant!”

Far more certain is that the jive will leave you out of breath and sweaty. “Forget the gym,” says Shirley. “This is a much ­better workout.” Agreed!

And it’s also a lot of fun. Who cares if you’re any good — it’s about having a go.

Aerial view of the MSC Virtuosa cruise ship sailing on blue waters with mountains in the background.The huge cruise ship accommodates over 6,300 guests Credit: Supplied Waterfalls cascading down a rocky, forested mountain into a body of water.Enjoy the stunning sights from on board the boat Credit: Supplied

And Shirley never lets on — despite being asked endlessly — that , and will be the hit BBC dance ­contest’s new presenters.

Before we finish, Shirley sets a challenge: To practice and film ourselves dancing the jive and she’ll post the best performances on social media.

MSC is an Italian line with an Italian vibe and if you’re looking for La Dolce Vita, you’ll find it on Virtuosa.

Deck 15’s Via Dei Cappellari points guests towards the swimming pools.

Deck 5’s Galleria Virtuosa is a replica Italian shopping arcade. Were it not topped by an LED Dome — which has mesmerising light shows projected onto it nightly — you’d think you were in Italy.

As for the buffet, it offers superb pizzas and pastas, though if you’d prefer a roast, that’s available too. And elsewhere there’s lots of glitter and glitz, from the champagne bar to the three-storey Swarovski crystal staircase in the atrium.

There’s no Deck 17, a number considered unlucky by Italians. There is, however, a Deck 13 and my balcony cabin is on it.

It’s stylish, roomy and, because the ship is sailing from Southampton for the summer, it has welcome British touches, like a kettle and Yorkshire tea bags.

Shirley Ballas in a black suit with sparkling embellishments, standing on a grand staircase.Virtuoso Shirley is scheduled to host several activities during the sailing Credit: Supplied Shirley Ballas on a cruise, wearing a long orange dress, with her arms raised in excitement.Jo Kessel shows off her unique dance moves on board the MSC Virtuos Credit: Supplied

My fellow passengers are an international bunch, most of whom are . They’re also younger than normal (the average age is 42) and like to dance.

Wherever you go, whatever the time of day, you’ll find dance classes and much hip-swivelling. The sessions are all free and feature pop, bachata, samba and rock.

I try salsa, hoping it will improve my jive. It doesn’t!

And much of the action happens in the Galleria. You can be walking along, window-shopping, when suddenly you’ll be swept up in a silent disco or flash mob.

That’s how I find myself performing Village People’s YMCA alongside hundreds of others.

It’s all rather joyous, a word used by Shirley multiple times during a Q&A session held later in the week in the ship’s theatre. She uses it to describe the experiences she seeks in life.

Of course, there’s plenty of en­ter­tainment that can be watched rather than participated in.

Such as the ship’s ABBA show, in which hits such as Mamma Mia and Waterloo are performed by a cast in flared trousers and tasselled costumes.

Then there’s Ajedrez, a Cirque du Soleil-style show whose acrobatics are so staggering it’s a struggle not to gasp in amazement or cover your eyes.

Even Shirley (who’s sat in the row behind me) thinks its fab!

I get off the ship in and — where the cobbled backstreets of Stavanger are lined by white clapboard houses so cutesy it’s as if they’ve been built for Instagram.

Yet for many guests, the ship itself is the destination and they can’t wait to get back on board.

MSC Virtuosa will be offering another Strictly-themed sailing in August when former pro-dancer Kristina Rihanoff will be on board to host masterclasses and dish up show gossip.

Meanwhile, I try to perfect the jive —  and at one point a fellow passenger even praises my leg extension. But I’m not happy enough with it to dare send a clip to Shirley.

I am inspired though, and will keep dancing. As for the cruise, it’s a 10 from me!

GO: STRICTLY CRUISE

SAILING THERE: Strictly dancer Kristina Rihanoff will join the next 12-night Strictly Come Dancing cruise on MSC Virtuosa, departing on August 8.

It sails from Southampton to the Canary Islands and back with calls at Vigo, Funchal, Las Palmas, Santa Cruz de Tenerife, Arrecife and Cadiz.

Price, including full-board and entertainment, is from £1,279pp.

See msccruises.co.uk .