Serena Williams’s Transformation Overview
Serena Williams spent 27 years being told her body was the wrong shape for tennis. She won 23 Grand Slam singles titles with it anyway. So when the most physically dominant woman in the history of the sport announced in August 2025 that she had lost 31 pounds using a GLP-1 medication, the conversation around drugs like semaglutide and tirzepatide shifted overnight.
The trigger was the aftermath of her second pregnancy. Williams gave birth to daughter Adira River on August 22, 2023, two years after stepping away from competition following the 2022 US Open. Despite training with the same intensity that produced Olympic gold and a Serena Slam, the weight would not move. She told People in August 2025 that she was working out consistently and eating well, and the scale simply refused to respond. Her joints hurt. Running had become uncomfortable.
A year after Adira’s birth, Williams consulted her doctor and began a weekly GLP-1 injection through Ro, the telehealth company her husband Alexis Ohanian had invested in. She has since become a spokesperson for the platform. The result: 31 pounds down, maintained, with significantly reduced joint pain and restored energy.
At 5 ft 9 in (175 cm), Williams competed at a listed weight of around 155 lbs (70 kg) during her prime — a figure that never captured how much of that was quadriceps, glutes, and shoulders. Her post-pregnancy peak weight has never been publicly disclosed, and she has declined to name a number. Only the 31-pound loss is confirmed.
Transformation Timeline
2011–2017: The Athletic Baseline
Williams’s physique was built, not inherited. After a life-threatening pulmonary embolism in early 2011 and a foot injury that cost her most of a season, she rebuilt with conditioning specialist Mackie Shilstone, whose program emphasized rotational core work, lateral movement, and cardiovascular endurance over raw mass. The payoff: the 2012 Wimbledon title and Olympic singles gold in London within four weeks of each other, followed by the most dominant stretch of her career.
Her first pregnancy ended in a September 2017 emergency C-section and a second pulmonary embolism, a near-fatal complication she has spoken about extensively. She returned at Indian Wells in March 2018, visibly rebuilding, and reached four Grand Slam finals over the next two years.
2022: Retirement and the End of Forced Conditioning
Williams announced her “evolution away from tennis” in a Vogue essay in August 2022, then played her final match on September 2, 2022, losing a three-set third-round battle to Ajla Tomljanović at Arthur Ashe Stadium. For the first time since childhood, there was no tournament calendar dictating her training block, no periodized peak, no reason to hit 500 serves in a session. Elite athletes almost always experience body composition shifts after retirement — the metabolic cost of professional training is enormous and disappears instantly.
2023: Second Pregnancy and the Plateau
Adira River arrived on August 22, 2023. Williams was 41. Postpartum recovery at 41 is a fundamentally different physiological problem than at 36 — hormonal shifts, changes in sleep architecture, and age-related decline in lean muscle mass all stack against weight loss. She kept training. She kept eating the way she had for years. Nothing happened.
2024: The Turning Point
By mid-2024, Williams was a year postpartum and stuck. Her frustration was compounded by the fact that she knew exactly what to do — she had spent her entire adult life executing elite-level fitness programs — and it wasn’t working. After a medical consultation, she started a GLP-1 receptor agonist through Ro’s program.
Results came steadily rather than dramatically. Williams has emphasized that she did not stop training or abandon her nutrition habits; the medication reduced appetite and food noise while she continued the work. She hosted the ESPY Awards in July 2024, looking noticeably leaner than at any point since retirement.
2025: The Disclosure
Williams appeared in the Super Bowl LIX halftime show on February 9, 2025, crip walking during Kendrick Lamar’s set — a full-circle moment referencing her 2012 Olympic celebration that put her physique in front of 130 million viewers. Speculation followed her across every red carpet through the spring.
In August 2025, she addressed it directly in People, confirming the 31-pound loss and her role with Ro. Crucially, she framed it around function rather than appearance: her joints stopped aching, she could run and play with her daughters without pain, and she felt like herself again. She also pushed back on the idea that the medication is a shortcut, stressing that it requires medical supervision, that she still trains and eats well, and that it is not appropriate for everyone.
The disclosure landed differently than celebrity GLP-1 admissions from Oprah Winfrey or others, precisely because Williams’s credibility on physical effort is unassailable. Nobody could accuse her of not trying hard enough.
Diet Changes
Williams has eaten predominantly plant-based since around 2012, when she shifted alongside her sister Venus Williams, who adopted a raw vegan protocol after her 2011 Sjögren’s syndrome diagnosis. Serena has cheerfully described herself as a “chegan” — a cheating vegan — and has never claimed strict adherence.
Her competitive-era staples were kale and spinach salads, quinoa, lentils, black bean dishes, and green smoothies built on spinach, banana, and almond milk. Her admitted weaknesses: tacos and french fries. During tournament weeks she tightened toward raw and minimally processed foods; in the off-season she loosened considerably.
The post-GLP-1 diet is not radically different in composition. What changed is volume and timing. GLP-1 medications slow gastric emptying and blunt appetite signaling, so portions shrink naturally and cravings quiet. Williams has said she still prioritizes protein and vegetables — a necessity, since rapid weight loss on these medications carries a real risk of lean muscle loss if protein intake drops. For a 43-year-old former athlete preserving hard-won muscle, adequate protein and resistance training are non-negotiable.
Workout Changes
The competitive Williams trained like a power athlete: on-court drills, sprint intervals, plyometric box work, resistance band shoulder circuits, Bosu ball balance work, medicine ball rotational throws, squats, lunges, and boxing sessions for conditioning. The goal was explosive force production over 2–3 hours of repeated maximal efforts.
Post-retirement, the objective flipped from performance to longevity. Her current approach leans toward strength maintenance, mobility, low-impact cardio, and recovery — training that protects joints rather than punishing them. She launched Will Perform, a topical pain-relief line, in 2023, which tells you how much recovery had come to occupy her thinking.
The important detail for anyone reading this as a template: Williams did not stop lifting when she started the medication. That is the difference between losing 31 pounds and losing 31 pounds of the right kind of weight.
Before and After Stats
| Stat | Before | After |
|---|---|---|
| Weight | Post-pregnancy peak not publicly disclosed (career listed weight approx. 70 kg / 155 lbs) | 31 lbs (approx. 14 kg) lighter than post-pregnancy peak |
| Height | 175 cm (5 ft 9 in) | 175 cm (5 ft 9 in) |
| Body Fat % | Never publicly disclosed | Never publicly disclosed |
| Build | Powerful, heavily muscled athletic frame; softer and heavier through 2024 postpartum plateau | Leaner, visibly reduced through the midsection and face; muscle definition retained |
| Reported symptoms | Joint pain, low energy, stalled weight loss despite training | Reduced joint pain, restored energy, weight maintained |
| Age at change | 42 (2024) | 43 (2025) |
Key Takeaways
Effort is not always the variable. Williams’s case eliminates the usual explanation. A 23-time Grand Slam champion training consistently and eating a plant-forward diet could not lose postpartum weight at 42. Metabolism, hormones, and age are real physiological forces, not excuses.
Medication is a tool, not a replacement. Williams kept training and kept her nutrition habits. GLP-1 drugs reduce appetite; they do not build muscle, improve cardiovascular fitness, or teach eating skills. Users who stop resistance training during rapid loss frequently shed significant lean mass and regain fat when they come off.
Medical supervision matters. Williams accessed the medication through a prescribing telehealth program after consulting a doctor — a point she has repeatedly emphasized. Given her history of two pulmonary embolisms and two C-sections, her medical picture is complex. Compounded or unsupervised GLP-1 use carries genuine risk.
Health markers beat scale numbers. The outcomes Williams highlights are functional: joints that don’t hurt, energy to keep up with two young children, the ability to run again. That framing is more useful than a goal weight.
Is it sustainable? Williams has maintained the loss for a year and appears to be on ongoing maintenance dosing, reflecting current clinical reality — these are generally long-term medications, and most patients regain substantial weight after stopping. That’s a tradeoff worth understanding before starting, and Williams, to her credit, has not pretended otherwise.
Frequently Asked Questions
How tall is Serena Williams?
Serena Williams is 5 feet 9 inches tall (175 cm). That makes her taller than the average American woman and slightly shorter than her sister Venus Williams.
How much does Serena Williams weigh?
Serena Williams weighs approximately 70 kg (154 pounds). Her muscular, power-based build has long been considered one of the most athletic physiques in women’s tennis.
How old is Serena Williams?
Serena Williams was born on September 26, 1981, in Saginaw, Michigan, USA. That makes her 44 years old as of 2026.
What is Serena Williams’ net worth?
Serena Williams’ net worth is estimated at around $300 million as of 2026. Her wealth comes from prize money, endorsements with brands like Nike and Gatorade, and her venture capital firm Serena Ventures.
Who is Serena Williams married to?
Serena Williams is married to Reddit co-founder Alexis Ohanian, whom she wed in November 2017. The couple has two daughters, Olympia and Adira.
What is Serena Williams best known for?
Serena Williams is best known as one of the greatest tennis players of all time, winning 23 Grand Slam singles titles — the most in the Open Era. She also claimed four Olympic gold medals and held the world No. 1 ranking for 319 weeks.
What does Serena Williams eat and how does she train?
Serena Williams follows a largely plant-based, mostly vegan diet built around raw vegetables, greens, lentils, and smoothies. Her training mixes on-court drills with resistance work, sprints, plyometrics, and core conditioning to fuel her explosive serve.
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Last Updated: October 25, 2026 | Source: Healthy Celeb
