Los Angeles, July 20 -- Model and entrepreneur Hailey Bieber has offered fans a glimpse into her postpartum fitness routine, revealing how her workouts have evolved since welcoming her son, Jack Blues Bieber, with husband Justin Bieber, according to E! News.

Taking to her Instagram Stories, the Rhode founder shared a video of herself lifting heavy weights during a workout.

"Ever since I've had my son, it's been a lot of:," Hailey wrote alongside the clip, which showed her training in workout gear and a waist trainer.

In another post, the 29-year-old shared a photo showcasing her toned physique while wearing a matching black sports bra and full-length workout pants.

Hailey, who previously became known among fans for her love of Pilates...