MILAN, ITALY - FEBRUARY 25:  Wissam al Mana and Janet Jackson attend the Giorgio Armani fashion show during Milan Fashion Week Womenswear Fall/Winter 2013/14 on February 25, 2013 in Milan, Italy.  (Photo by Vittorio Zunino Celotto/Getty Images)
PHOTO: Vittorio Zunino Celotto/Getty Images Europe/Getty Images
MILAN, ITALY - FEBRUARY 25: Wissam al Mana and Janet Jackson attend the Giorgio Armani fashion show during Milan Fashion Week Womenswear Fall/Winter 2013/14 on February 25, 2013 in Milan, Italy. (Photo by Vittorio Zunino Celotto/Getty Images)
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Story highlights

Singer is currently on her "State of the World" tour

Trainer focused on weights to help star transform her body after having baby

(CNN) —  

Janet Jackson’s dance moves aren’t the only thing garnering applause from fans during her “State of the World” tour.

The 51-year-old new mom is sporting a sleek physique that her trainer says she accomplished without putting in massive hours of cardio, reportedly shedding 70 pounds.

NEW YORK, NY - NOVEMBER 09:  Janet Jackson attends OUT Magazine #OUT100 Event presented by Lexus at the the Altman Building on November 9, 2017 in New York City.  (Photo by Bryan Bedder/Getty Images for OUT Magazine)
PHOTO: Bryan Bedder/Getty Images for OUT Magazine
NEW YORK, NY - NOVEMBER 09: Janet Jackson attends OUT Magazine #OUT100 Event presented by Lexus at the the Altman Building on November 9, 2017 in New York City. (Photo by Bryan Bedder/Getty Images for OUT Magazine)

Paulette Sybliss told E! she started a “vigorous training schedule” with the superstar six weeks after the singer gave birth to son Eissa in January.

“We were training a minimum of four times a week, and the sessions were never less than 45 minutes, no more than an hour,” Sybliss said. “Very intense though, very intense training.”

And while Jackson was intent on shedding her pregnancy pounds, Sybliss said she focused the training on adding lean muscle to her client to help her be in her best shape for the concert tour.

The trainer said they did back-to-back weight exercises rather than cardio to get Jackson’s heart rate up and to help her burn fat.

“What that does – you would look at her and think she’d done like an hour of cardio with me – but when you’re working with weights and you’re working the muscle that way, it elevates the heart rate, but also it’s creating that fat-burning effect, both during the session and also when she left me, and that was key,” Sybliss said.

As for diet, Sybliss said she believes moderation is the key, and she doesn’t sweat her clients about cheating every now and then.

“If Janet feels that she needs to have a chocolate cake, go ahead and have a chocolate cake,” Sybliss said. “You’re not eating it every day. You won’t get fat overnight.”