Former Destiny’s Child singer Kelly Rowland says she has lost 70 pounds just four months after giving birth to son Titan in November.

The singer tells the New York Post she shed the weight by working out with Hollywood trainer Jeanette Jenkins and taking fitness classes at SoulCycle.

“When I go in there and it’s the wee hours of the morning, [instructor Angela Davis] is a great secret, so motivational and Jeanette comes in with so much energy and this huge smile on her face and you can’t help but to get excited about working out,” Rowland recently told Extra!

The 34-year-old welcomed her first child with husband Tim Witherspoon in November.