Cardi B is already back in the gym after giving birth to baby No. 4 .

The rapper, who welcomed her and boyfriend Stefon Diggs’ first child together last week, was filmed working out at a New Jersey gym Thursday.

In a clip obtained by TMZ , the Grammy winner worked out in a black sports bra, matching leggings and white tennis shoes.

The 33-year-old worked out with trainers, according to the outlet, and only stopped for a couple of brief breaks.

Later that same day, Cardi told her Instagram followers that her little one had arrived .

“My life has always been a combination of different chapters and different seasons,” she wrote Thursday. “My last chapter was the beginning of a new season. Starting over is never easy but it’s been so worth it!”

Cardi continued, “I brought new music

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