Sia Cooper is one of America’s most beloved fitness influencers and the creative force behind the wildly popular blog Diary of a Fit Mommy. A nurse turned NASM certified personal trainer, Sia transformed her own body after struggling with weight gain and unhealthy habits during nursing school – and turned that personal journey into a global fitness movement. With over 2.4 million Instagram followers and a thriving YouTube channel, she continues to inspire moms everywhere to prioritize their health, embrace body confidence, and stay fit through every stage of motherhood.
Sia Cooper Personal Information
| Category | Details |
|---|---|
| Full Name | Sia Cooper |
| Date of Birth | March 1, 1989 |
| Age | 37 Years Old (as of 2026) |
| Nationality | American |
| Profession | Fitness Influencer, NASM Certified Personal Trainer, Blogger |
| Platforms | Instagram, YouTube, Facebook |
| Known For | Diary of a Fit Mommy Blog, Postpartum Fitness |
| Net Worth | ~$2.1 Million (widely cited estimate; not independently verified) |
| Spouse | Grady Cooper (Air Force Diet Therapist) |
| Children | Greyson (son), Evie (daughter) |
Sia Cooper Body Measurements
| Measurement | Details |
|---|---|
| Height | 5 ft 5 in (165 cm) |
| Weight | ~125 lbs (57 kg) |
| Bust | 34 inches |
| Waist | 24 inches |
| Hips | 34 inches |
| Bra Size | 34B |
| Body Type | Athletic / Toned |
| Eye Color | Brown |
| Hair Color | Dark Brown |
Sia Cooper Bio & Career
Sia Cooper’s journey to becoming one of the most recognized fitness influencers in the world is a story of genuine transformation. Before building her empire, Sia was a registered nurse who found herself struggling with weight gain and poor health habits during her demanding nursing school years. A pivotal moment came when she watched the Netflix documentary Food Inc., which prompted her to overhaul her diet and lifestyle completely.
Motivated by her own results and passionate about helping other women – especially moms – do the same, Sia launched Diary of a Fit Mommy, a blog and social media brand that quickly resonated with millions. Her platform delivers workout plans, healthy recipes, prenatal and postpartum fitness guidance, and honest conversations about motherhood and body image. What sets Sia apart is her authenticity: she openly shares her “body jiggles,” real postpartum struggles, and the truth that “perfect does not exist.”
Sia earned her NASM certification as a personal trainer, bringing professional credibility to her content. Her YouTube channel, Shape Up With SIA, features workout videos, recipe tutorials, and fitness motivation tailored to moms at every stage – from pregnancy through postpartum recovery and beyond.
She is married to Grady Cooper, an Air Force Diet Therapist, and together they live in Destin, Florida with their two children: son Greyson and daughter Evie. With a widely cited (though unverified) net worth estimate of around $2.1 million, Sia has successfully monetized her passion through brand partnerships, digital products, and a loyal community of fitness-driven moms.
Latest News – Sia Cooper (2026)
- Shape Up With SIA YouTube Expansion: Sia’s YouTube channel continues to grow in 2026, with fresh workout videos, postpartum recovery content, and healthy recipe tutorials dropping regularly.
- Diary of a Fit Mommy Platform Growth: Her flagship blog and community platform remains one of the top destinations for fit moms, with new programs and challenges launched throughout 2026.
- Body Positivity Advocacy: Sia continues to champion realistic fitness standards, encouraging women to embrace their natural bodies and reject unrealistic media portrayals.
- Brand Partnerships: Sia is actively collaborating with wellness and nutrition brands in 2026, expanding her influence across health, food, and fitness categories.
- Community Milestones: With over 2.4 million Instagram followers, Sia’s community continues to grow as more moms discover her no-nonsense, relatable approach to fitness.
Sia Cooper in 2026: The TIME Magazine Moment, Her Real Numbers, and the Cause She Champions
One of the most surprising chapters in Sia’s rise had nothing to do with her own posts. TIME included her on its list of the 25 Most Influential People on the Internet after an Instagram algorithm change began surfacing her comments as one of the “sticky,” frequently-visible replies on celebrity posts from figures like Kim Kardashian West and Chrissy Teigen. The unexpected visibility brought her roughly 80,000 new followers in a short span and, according to TIME’s reporting at the time, contributed to annual influencer earnings estimated around $500,000.
From a nursing-school weight-loss blog to a 350,000-visitor-a-month platform
Diary of a Fit Mommy didn’t start as a business. Sia launched it in 2013, while pregnant with her first child, purely as a way to hold herself accountable – a habit that grew out of an earlier transformation in 2010, when she lost close to 50 pounds after watching Food Inc. while still in nursing school. The blog now draws an average of 350,000 visitors a month.
An advocate for Breast Implant Illness awareness
Beyond fitness content, Sia has used her platform to speak openly about her own breast implant surgery and to raise awareness of Breast Implant Illness, after hearing from numerous followers experiencing symptoms with few resources available to them.
Net worth: a single, unverified figure
Sia Cooper’s net worth is commonly cited at around $2.1 million, a figure that appears consistently across influencer-earnings trackers – but like most of these estimates, it is not based on any disclosed financial statement and should be read as a rough approximation rather than fact.
FAQs
Who is Sia Cooper?
Sia Cooper is an American fitness influencer, NASM certified personal trainer, and blogger best known for her platform Diary of a Fit Mommy, which focuses on fitness, nutrition, and wellness for mothers.
How old is Sia Cooper?
Sia Cooper was born on March 1, 1989, making her 37 years old as of 2026.
How tall is Sia Cooper?
Sia Cooper stands at 5 feet 5 inches (165 cm) tall.
What is Sia Cooper’s net worth?
Sia Cooper’s net worth is commonly estimated at around $2.1 million, though this figure comes from influencer-earnings trackers rather than any verified financial disclosure.
Is Sia Cooper married?
Yes, Sia Cooper is married to Grady Cooper, an Air Force Diet Therapist. They have two children – son Greyson and daughter Evie.
Where can I follow Sia Cooper?
You can follow Sia Cooper on Instagram (@diaryofafitmommy), YouTube (Shape Up With SIA), and Facebook for daily fitness tips, recipes, and motivational content.
