Stephanie Sanzo

Stephanie Sanzo, born on April 2, 1987, is an Australian weightlifter, fitness trainer, social media figure, influencer, model, and entrepreneur. Known online as Steph Fit Mum, she gained widespread recognition for her heavy weight training, powerlifting, and viral online workout videos.

Sanzo was raised in the regional border town of Albury–Wodonga, Australia. She later relocated to Geelong, Victoria, after taking a job with the retailer Cotton On, a position she left following her first pregnancy. In 2012, after experiencing pelvic floor collapse and gaining 25 kilograms following her first birth, Sanzo began focusing on her physical health. Initially running outside, she eventually transitioned into gym workouts, light cardio, and weightlifting.

As her physique changed, Sanzo began sharing fitness photos on Instagram and participated in a bikini model competition. After noticing growing follower engagement, she shifted her content focus strictly to fitness-inspired posts. To support her fitness regime, she hired personal trainer Ingrid Barclay and eventually became a qualified personal trainer herself by completing Certificate III and IV studies at VFA Training in Geelong. By 2017, she was earning an income through platforms including Instagram, Facebook, Kik, and Snapchat.

In 2018, Sanzo collaborated with Australian fitness trainer Kayla Itsines on the personal training app SWEAT. She developed the program BUILD, which focuses on heavy strength training, and was featured on the cover of the inaugural issue of STRONG Fitness Magazine Australia in 2019. Sanzo later established her own training program, LIFTit with Stephanie Sanzo, and began developing a meal planning app called Meal Engine.

Sanzo has established a substantial online presence across platforms such as YouTube, TikTok, Facebook, and Instagram. A number of her training clips have achieved high viewership, including a viral video from early 2023 featuring a 330-pound Sumo deadlift that accumulated tens of millions of views. Her digital platforms continue to feature content centered on fitness instruction and strength training.