The 40-year-old was all smiles as she told her 10.9million followers: 'So, I'm starting to feel like my old self again. I was actually finally able to put me in a cute little Fabletics outfit.'
She put her taut figure on display in the skintight Propel two-piece seamless bra and leggings look, with the matching Cassidy seamless jacket.
'It's the Propel look, to propel me forward to working out,' she joked as she did some running poses, adding: 'Because I'm excited to get to work out again. I got two more weeks 'til I can!'
Rowland did a little dance in her cute gym ensemble, as her son Titan Jewell, six, could be heard yelling for 'mommy', before she answered without missing a beat: 'Yes, son?'
She shares Titan and Noah with husband Tim Weatherspoon, 46, whom she married in Costa Rica back in May of 2014.
The Destiny's Child alum announced their new addition last month on Instagram, posting a photo of Titan doting on his baby brother.
She wrote: 'On the 21st day, of the 21st year, of the 21st Century, Noah Jon Weatherspoon greeted us! We are truly grateful.'
Rowland recently told Billboard: 'I still don't know how to be a mother of two, exactly, but I'm figuring it out. It's going to be a unique experience -- Titan's not like anyone else on this planet, Noah's not like anyone else on this planet.
'I'm still navigating myself through motherhood. So the less pressure I put on myself and allow myself grace -- because I'm not going to get it right every single time – I think it's only fair to just breathe and use your instincts to navigate your way through. But I've learned not to put so much pressure on myself and to let my creativity flow.'
Her creativity has flown into her latest EP K, which dropped this month, along with the single Black Magic.
The Bad Hair actress said: 'To be able to drop this project during Black History Month… It all means Black magic to me. It's been so awesome to be able to have my son, have my 40th, and of course drop the record in Black History Month -- to me that is the definition of Black magic.'