How Meghan Markle has been staying in shape since giving birth to baby Archie

Meghan Markle is in no hurry to get her pre-baby body back.

ET recently spoke with royal expert Katie Nicholl, who tells ET that the 37-year-old Duchess of Sussex has been taking a relaxed approach to fitness since giving birth in May to her first child -- son Archie -- with her husband, Prince Harry.

"Before she fell pregnant, you know, Meghan was very fit," Nicholl notes. "She was very into her fitness regime. She used to run around the park in Kensington, but she has been taking it easy. And I hear that yoga is very much on her post-birth fitness regime -- nothing too strenuous."

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First photos of Baby Sussex
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First photos of Baby Sussex
Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan, Duchess of Sussex, pose for a photo with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
WINDSOR, ENGLAND - MAY 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex, pose with their newborn son during a photocall in St George's Hall at Windsor Castle on May 8, 2019 in Windsor, England. The Duchess of Sussex gave birth at 05:26 on Monday 06 May, 2019. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
EMBARGOED to 1240 WEDNESDAY MAY 08 2019. The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan, Duchess of Sussex, pose for a photo with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan, Duchess of Sussex, pose for a photo with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
Britain's Prince Harry and Meghan, Duchess of Sussex are seen with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle, in Berkshire, Britain May 8, 2019. Dominic Lipinski/Pool via REUTERS
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
WINDSOR, ENGLAND - MAY 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex, pose with their newborn son during a photocall in St George's Hall at Windsor Castle on May 8, 2019 in Windsor, England. The Duchess of Sussex gave birth at 05:26 on Monday 06 May, 2019. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan, Duchess of Sussex, pose for a photo with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
Britain's Prince Harry, Duke of Sussex (R), and his wife Meghan, Duchess of Sussex, pose for a photo with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
WINDSOR, ENGLAND - MAY 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex, pose with their newborn son during a photocall in St George's Hall at Windsor Castle on May 8, 2019 in Windsor, England. The Duchess of Sussex gave birth at 05:26 on Monday 06 May, 2019. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
Meghan, Duchess of Sussex, places her hand on the head of her newborn baby boy as she and her husband Britain's Prince Harry, Duke of Sussex, pose for a photo in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
WINDSOR, ENGLAND - MAY 08: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex, pose with their newborn son during a photocall in St George's Hall at Windsor Castle on May 8, 2019 in Windsor, England. The Duchess of Sussex gave birth at 05:26 on Monday 06 May, 2019. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex (L), and his wife Meghan, Duchess of Sussex, walk away after posing for photographs with their newborn baby son in St George's Hall at Windsor Castle in Windsor, west of London on May 8, 2019. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire.
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"As I say, the whole approach has been holistic, it has been gentle," Nicholl continues. "It's been a natural embracing of motherhood, and with that has come a pretty gentle routine. ... Meghan hasn't been hitting the gym. She hasn't been in any hurry to get back in shape. It's only four weeks really since the birth and she's been taking that exercise regime very gently, indeed."

According to Nicholl, Meghan has been practicing yoga with her mother, Doria Ragland, who's a yoga teacher.

"Apparently Doria took up postpartum yoga and baby yoga, and that's all Meghan has been doing," Nicholl says. "And lots of proud walks around Windsor Great Park, so, gentle exercise, but no hard training, no weights. She's apparently not in any hurry to ping back into shape. She's enjoying this time. She's being gentle to herself."

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Meghan Markle and mother Doria Ragland together
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Meghan Markle and mother Doria Ragland together
Meghan, Duchess of Sussex (C) arrives with her mother, Doria Ragland (L) and Britain's Prince Harry, Duke of Sussex to host an event to mark the launch of a cookbook with recipes from a group of women affected by the Grenfell Tower fire at Kensington Palace in London on September 20, 2018. (Photo by Ben STANSALL / POOL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Meghan, Duchess of Sussex (C) arrives with her mother, Doria Ragland (L) and Britain's Prince Harry, Duke of Sussex to host an event to mark the launch of a cookbook with recipes from a group of women affected by the Grenfell Tower fire at Kensington Palace in London on September 20, 2018. (Photo by Ben STANSALL / POOL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Meghan, Duchess of Sussex (C), her mother, Doria Ragland (L) and Britain's Prince Harry, Duke of Sussex take part in the launch of a cookbook with recipes from a group of women affected by the Grenfell Tower fire at Kensington Palace in London on September 20, 2018. (Photo by Ben STANSALL / POOL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
WINDSOR, ENGLAND - MAY 19: Meghan Markle and mother Doria Ragland arrive at St George's Chapel, Windsor Castle on May 19, 2018 in Windsor, England. Among the guests were 2200 members of the public, the royal family and Ms. Markle's Mother Doria Ragland. (Photo by Jackson Lee/GC Images)
Doria Ragland and Meghan Markle make their way to Windsor Castle for her wedding to Prince Harry.
NEWS EDITORIAL USE ONLY. NO COMMERCIAL USE. NO MERCHANDISING, ADVERTISING, SOUVENIRS, MEMORABILIA or COLOURABLY SIMILAR. NOT FOR USE AFTER 31 DECEMBER 2018 WITHOUT PRIOR PERMISSION FROM KENSINGTON PALACE. NO CROPPING. Copyright in the photograph is vested in The Duke and Duchess of Sussex. Publications are asked to credit the photograph to Alexi Lubomirski. No charge should be made for the supply, release or publication of the photograph. The photograph must not be digitally enhanced, manipulated or modified in any manner or form and must include all of the individuals in the photograph when published. This official wedding photograph released by the Duke and Duchess of Sussex shows The Duke and Duchess in The Green Drawing Room, Windsor Castle, with (left-to-right): Back row: Master Jasper Dyer, the Duchess of Cornwall, the Prince of Wales, Ms. Doria Ragland, The Duke of Cambridge; middle row: Master Brian Mulroney, the Duke of Edinburgh, Queen Elizabeth II, the Duchess of Cambridge, Princess Charlotte, Prince George, Miss Rylan Litt, Master John Mulroney; Front row: Miss Ivy Mulroney, Miss Florence van Cutsem, Miss Zalie Warren, Miss Remi Litt.
US actress and fiancee of Britain's Prince Harry Meghan Markle (L) arrives with her mother Doria Ragland at Cliveden House hotel in the village of Taplow near Windsor on May 18, 2018, the eve of her wedding to Britain's Prince Harry. - Britain's Prince Harry and US actress Meghan Markle will marry on May 19 at St George's Chapel in Windsor Castle. (Photo by STEVE PARSONS / POOL / AFP) (Photo credit should read STEVE PARSONS/AFP/Getty Images)
US actress and fiancee of Britain's Prince Harry Meghan Markle (L) arrives with her mother Doria Ragland at Cliveden House hotel in the village of Taplow near Windsor on May 18, 2018, the eve of her wedding to Britain's Prince Harry. - Britain's Prince Harry and US actress Meghan Markle will marry on May 19 at St George's Chapel in Windsor Castle. (Photo by STEVE PARSONS / POOL / AFP) (Photo credit should read STEVE PARSONS/AFP/Getty Images)
US actress and fiancee of Britain's Prince Harry Meghan Markle (L) arrives with her mother Doria Ragland at Cliveden House hotel in the village of Taplow near Windsor on May 18, 2018, the eve of her wedding to Britain's Prince Harry. - Britain's Prince Harry and US actress Meghan Markle will marry on May 19 at St George's Chapel in Windsor Castle. (Photo by STEVE PARSONS / POOL / AFP) (Photo credit should read STEVE PARSONS/AFP/Getty Images)
US actress and fiancee of Britain's Prince Harry Meghan Markle (2nd R) arrives with her mother Doria Ragland (R) at Cliveden House hotel in the village of Taplow near Windsor on May 18, 2018, the eve of her wedding to Britain's Prince Harry. - Britain's Prince Harry and US actress Meghan Markle will marry on May 19 at St George's Chapel in Windsor Castle. (Photo by STEVE PARSONS / POOL / AFP) (Photo credit should read STEVE PARSONS/AFP/Getty Images)
US actress and fiancee of Britain's Prince Harry Meghan Markle (L) arrives with her mother Doria Ragland at Cliveden House hotel in the village of Taplow near Windsor on May 18, 2018, the eve of her wedding to Britain's Prince Harry. - Britain's Prince Harry and US actress Meghan Markle will marry on May 19 at St George's Chapel in Windsor Castle. (Photo by STEVE PARSONS / POOL / AFP) (Photo credit should read STEVE PARSONS/AFP/Getty Images)
Prince Harry's girlfriend Meghan Markle (right) is pictured with her mother Doria Ragland during the Invictus Games Closing Ceremony Air Canada Centre in Toronto, Canada. (Photo by Danny Lawson/PA Images via Getty Images)
Prince Harry (right) and Meghan Markle (2nd right), are pictured with left to right Jessica Mulroney, Meghan's mother Doria Ragland and Markus Anderson during the Invictus Games Closing Ceremony Air Canada Centre in Toronto, Canada. (Photo by PA Images via Getty Images)
Meghan Markle, girlfriend of Britain's Prince Harry, and her mother Doria Ragland watch the closing ceremony for the Invictus Games in Toronto, Ontario, Canada September 30, 2017. REUTERS/Mark Blinch TPX IMAGES OF THE DAY
NEW YORK, NY - MARCH 10: Meghan Markle and Doria Ragland attend UN Women's 20th Anniversary of the Fourth World Conference of Women in Beijing at Manhattan Centre at Hammerstein Ballroom on March 10, 2015 in New York City. (Photo by Sylvain Gaboury/Patrick McMullan via Getty Images)
NEW YORK, NY - MARCH 10: Meghan Markle and Doria Ragland attend UN Women's 20th Anniversary of the Fourth World Conference of Women in Beijing at Manhattan Centre at Hammerstein Ballroom on March 10, 2015 in New York City. (Photo by Sylvain Gaboury/Patrick McMullan via Getty Images)
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Meghan is no stranger to taking a holistic, natural approach. In April, ahead of Archie's birth, Meghan and 34-year-old Harry were spotted making a visit to the natural remedy store ilapothecary, described on their website as an "urban hideaway" that offers "healing therapies, unique remedies and workshops to help you create solutions to issues you may be facing, relieve bodily symptoms and escape from stresses of urban living."

Last March, Nicholl told ET that Meghan's healthy lifestyle has been a good influence on Harry.

"There's a park outside Kensington Palace and Meghan has been seen running a circuit there. She's often in and out of the gym," Nicholl said at the time. "Meghan is a complete fitness fanatic. She loves to run laps around Kensington gardens, which is just outside Kensington Palace. I'm told that she's a fan of a private members club that does intensive fitness training classes, it's called the Skinny B**ch Collective. She was introduced to it by her friend, Millie Mackintosh. She loves her yoga, in fact, she starts most mornings with a yoga ritual and that's rubbed off on Prince Harry."

"One of the things I was told by a friend of his .... is that he's also getting into yoga," she continued. "He likes to start his day with a green juice now, just like Meghan, and his friends all find this very amusing that he's turned into a bit of a fitness fanatic himself. You'll often see him visiting the gym and he's given up his beloved Marlboro Lights, or at least he's smoking less and he's drinking less. So, Meghan and her green L.A. lifestyle I think have really rubbed off on the prince, and for the better."

For more on how being new parents has also brought Meghan and Harry closer to Kate Middleton and Prince William, watch the video below:

Related: Meghan before becoming a royal

25 PHOTOS
Meghan Markle in Hollywood before becoming a royal
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Meghan Markle in Hollywood before becoming a royal
EAST HAMPTON, NY - AUGUST 26: Meghan Markle attends COACH Legacy Photo Exhibit by REED KRAKOFF at Coach on August 26, 2006 in East Hampton, NY. (Photo by Billy Farrell/Patrick McMullan via Getty Images)
Meghan Markle during Kari Feinstein Pre-Emmy Style Lounge - Day Two in Los Angeles, California, United States. (Photo by Jean-Paul Aussenard/WireImage for Kari Feinstein PR)
DEAL OR NO DEAL -- Season 2 -- Pictured: Meghan Markle -- Photo by: Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images)
DEAL OR NO DEAL -- Episode 235 -- Pictured: (l-r) Lisa Gleave (3), Tameka Jacobs (21), Meghan Markle (24) -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
DEAL OR NO DEAL -- Episode 236 -- Pictured: Meghan Markle -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
DEAL OR NO DEAL -- Episode 228 -- Pictured: Meghan Markle -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - SEPTEMBER 18: Actress Meghan Markle attends the DPA pre-Emmy Gift Lounge at the Peninsula Hotel on September 18, 2009 in Beverly Hills, California. (Photo by Amanda Edwards/Getty Images)
NFL CHARACTERS UNITE -- Panel with Sports Illustrated -- Pictured: Meghan Markle -- (Photo by: Andrew Toth/USA Network/NBCU Photo Bank via Getty Images)
NBCUNIVERSAL EVENTS -- NBCUniversal Press Tour, January 2014 -- 'Suits' Session -- Pictured: Meghan Markle -- (Photo by: Chris Haston/USA/NBCU Photo Bank via Getty Images)
USA NETWORK EVENTS -- '2013 USA Network Upfront at Pier 36 in New York City on Thursday, May 16, 2013' -- Pictured: Meghan Markle -- (Photo by: Ilya Savenok/USA Network/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - OCTOBER 11: Actress Meghan Markle arrives at the Anti-Defamation League Entertainment Industry Awards Dinner at the Beverly Hilton on October 11, 2011 in Beverly Hills, California. (Photo by Amanda Edwards/Getty Images)
BEVERLY HILLS, CA - OCTOBER 11: Actress Meghan Markle arrives at the Anti-Defamation League Entertainment Industry Awards Dinner at the Beverly Hilton on October 11, 2011 in Beverly Hills, California. (Photo by Amanda Edwards/Getty Images)
LOS ANGELES, CA - NOVEMBER 13: Meghan Markle arrives at the GQ Men Of The Year Party at Chateau Marmont Hotel on November 13, 2012 in Los Angeles, California. (Photo by Jeffrey Mayer/WireImage)
WEST HOLLYWOOD, CA - NOVEMBER 12: Actress Meghan Markle attends the TV Guide Magazine Hot List Party at SkyBar at the Mondrian Los Angeles on November 12, 2012 in West Hollywood, California. (Photo by Paul Archuleta/FilmMagic)
LONDON, ENGLAND - NOVEMBER 19: Meghan Markle attends the London Global Gift Gala at ME Hotel on November 19, 2013 in London, England. (Photo by Gareth Cattermole/Getty Images)
LONDON, ENGLAND - NOVEMBER 11: Meghan Markle attends the UK Premiere of 'The Hunger Games: Catching Fire' at Odeon Leicester Square on November 11, 2013 in London, England. (Photo by Karwai Tang/WireImage)
NEW YORK, NY - OCTOBER 30: Actress Meghan Markle attends American Ballet Theatre 2013 Opening Night Fall Gala at David Koch Theatre at Lincoln Center on October 30, 2013 in New York City. (Photo by Gary Gershoff/WireImage)
NEW YORK, NY - OCTOBER 02: Model/actress Meghan Markle attends the Gala Tribute To Cate Blanchett during the 51st New York Film Festival at Alice Tully Hall at Lincoln Center on October 2, 2013 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - SEPTEMBER 11: Actress Meghan Markle enters the Mercedes-Benz Fashion Week at Lincoln Center for the Performing Arts on September 11, 2013 in New York City. (Photo by Ray Tamarra/Getty Images)
NEW YORK, NY - SEPTEMBER 11: Meghan Markle attends the 2013 Cantor Fitzgerald And BGC Partners Charity Day at Cantor Fitzgerald on September 11, 2013 in New York City. (Photo by Henry S. Dziekan III/WireImage)
NEW YORK, NY - OCTOBER 28: Model Meghan Markle attends the Elton John AIDS Foundation's 13th Annual An Enduring Vision Benefit at Cipriani Wall Street on October 28, 2014 in New York City. (Photo by Jamie McCarthy/WireImage)
DUBLIN, IRELAND - OCTOBER 17: Meghan Markle Amrican actress, spokesperson and model attends the 'Bridging the Gender Gap' special session at the Convention Centre on October 17, 2014 in Dublin, Ireland. The summit, which is in its fifth year, connects and guides young talent from around the world with global leaders and public figures acting as One Young World counsellors. This year's theme is Peace and Conflict Resolution and will use Ireland's history as an example to guide discussion. (Photo by Clodagh Kilcoyne/Getty Images)
NEW YORK, NY - SEPTEMBER 05: Model Meghan Markle attends an exclusive preview of the Marchesa Voyage for ShopStyle collection on September 5, 2014 in New York City. (Photo by Neilson Barnard/Getty Images for ShopStyle)
NEW YORK, NY - SEPTEMBER 05: Model Meghan Markle attends Peter Som during MADE Fashion Week Spring 2015 at Milk Studios on September 5, 2014 in New York City. (Photo by Paul Morigi/WireImage)
NEW YORK, NY - MAY 15: Meghan Markle attends the 2014 NBCUniversal Cable Entertainment Upfronts at The Jacob K. Javits Convention Center on May 15, 2014 in New York City. (Photo by D Dipasupil/FilmMagic)
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