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Celebrities and Their Fitness Routines: What’s Really Behind Body Transformations?

Oct. 15 2025, Published 1:58 a.m. ET

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Any kind of positive body transformation is bound to attract attention, even if you’re not a celebrity. Taking time away from a certain group and coming back looking healthier and happier is certain to have other people noticing and complimenting you. However, rarely do we see such stark body transformations as we do in the celebrity world. What is the secret behind insane transformations as seen by the likes of Chris Hemsworth, Alison Hammond, Kumail Nanjiani and Rebel Wilson? Let’s take a look!

Before we take a deep dive into the fitness regimes and dietary habits of celebrities who have undergone major body transformations, we first must pay attention to the importance of taking rest days. Becoming healthier is a process, and pushing yourself too hard can not only lead to physical injury but also mental exhaustion. It’s important that we have a hobby that isn’t physical which we can engage with on our rest days. Even Michael Jordan, who is at the peak of physical fitness, takes time away from the gym and court to gamble in casinos.

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Another thing that leads celebrities to undergo these transformations is their work. Many celebrities, especially actors, undergo impressive physical transformations for the sake of an upcoming role. Take Chris Pratt, for example, who lost 60 pounds in six months during training for Guardians of the Galaxy or Brie Larson, who was famously able to push a 5000-pound jeep with a full tank of gas for sixty seconds while training for her role in Captain Marvel. Even some famous athletes, such as MMA fighter Paddy Pimblet (Paddy the Baddy), are known for putting on weight between fights, then quickly losing it through vigorous training coming up to their next match.

Although we regularly hear about the fitness routines celebrities undergo in order to transform their bodies physically, we rarely hear as much about their diets. This is a shame, because eating the correct foods is just as important as committing to the workouts. The purpose of the body transformation will determine how the person’s diet has changed. Those wishing to lose weight are, of course, likely to reduce their overall calorie intake and choose more natural foods that are not processed. Whereas those looking to build muscle will be looking for high-protein nutrition and healthy dairy products.

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