The actress and entrepreneur, 36, shared a photograph of herself, red-faced and sweating, next to her trainer Aaron Hines, here on Monday online, reports people.com.
"Got back in the saddle ... ish was hard. #6weekspostpartum thanks Aaron Hines, Cycle House and Tracy Dawn for motivating me," she wrote in the caption.
Alba and her husband, Cash Warren, welcomed their third child on December 31.
The newest member of the family joins Alba and Warren's two daughters: Haven Garner, 6, and Honor Marie, 9.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)