Ciara Starts Fitness Journey to Lose 48 Lbs. After Giving Birth: 'Going to Work Really Hard'

Ciara is letting fans in on her postpartum fitness plan, revealing that she hopes to lose 48 lbs. after giving birth to her third child, son Win Harrison, last month.

The "Rooted" singer, 34, shared a photo on Instagram Monday, sharing in the caption that she's going to "work really hard" to lose her baby weight.

"48lbs to go! Starting the game plan tomorrow!!" Ciara captioned the post. "P.s. don’t know how easy it’s going be considering 3 baby’s now! Going to work really hard at this! Let’s go Mamma’s 💃🏽💪🏽"

Ciara and husband Russell Wilson welcomed Win — who was named for the Seahawks quarterback's late father — on July 23. The couple are also parents to daughter Sienna Princess, 3, and Ciara's son Future Zahir, 6.

The "1, 2 Step" singer opened up to PEOPLE the week after Win was born about the challenge of jumping from two kids to three, saying that there will "definitely going to be a lot of learning to do because every day is a new day in this era."

"But I think as a parent, once you have two, any more after that it's like you're ready," she added. "A baby has so many milestones and there's so much to look forward to."

"It's a house full of love," she said.

Win's older siblings Sienna and Future were anticipating his arrival, Ciara told PEOPLE one day before giving birth.

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"Sienna's been practicing doing the diapers on her baby doll, and Future says he's going to teach him a lot of stuff," she said. "I find them playing in the baby's room like it's their own. It's really sweet."

While Ciara has described her pregnancy with Win as her "slowest pregnancy of all," the singer certainly didn't slow down herself leading up to the delivery. The new mother of three recently spoke about working on her newest song, "Rooted," while in labor with Win.

"I was so proud of the process because I shot the video two weeks away from delivery for one part, and then I shot the other part just two days out," she said in a behind-the-scenes look at the music video's making.

"I probably could only do each take for like two minutes and then I needed to take a break," she explained in the video. "It also felt good working on it while knowing I was about to give birth to my newest angel, I was still grinding, and making it all happen at the same time."

"Even down to literally being in labor having to give approvals for the song to make the deadlines — it was just an incredible experience that I will forever cherish."