What Are the Biggest Weight Loss Myths? A 26-Year Trainer Answers (Filmed)

The biggest weight loss myth, says San Antonio trainer Sonia Renee, is that it all comes down to calories in, calories out. Her words on camera: "sometimes it's not all about the calories." She has coached since 2000, and some of her clients have stayed 20 years. We filmed 31 minutes with her: the myths she hears most, what she coaches instead, and what she says keeps results for the long run.

Filmed at Sonia Renee's private studio in San Antonio. Published August 2026.

Fit Local founder Conley Miller sat down with Sonia Renee for our trainer interview series, the same filmed format as what a real personal training session looks like. A profile photo cannot show you how a coach thinks after 26 years. Thirty-one unscripted minutes can.

One thing before her answers: everything below is one experienced coach's professional opinion, on camera. It is not medical advice.

Who is Sonia Renee?

Sonia has been a trainer since 2000. She puts it plainly in the interview: 26 years.

She grew up an athlete: basketball, track, cheer. She went to college planning to coach basketball, then changed course. Her reasons, in her own words: "I have a passion for helping people" and "I didn't want to go to med school."

The bridge between those two was an internship at "a hospital-based fitness and wellness center", where she worked around cardiac rehab, pulmonary rehab, seniors, and a women's unit, and watched what training did for them. She studied psychology and kinesiology. Her first fitness employer took a chance on the degree; her version is shorter: "they hired me because I had a degree."

She stayed four and a half years, until the company sold to a bigger corporation and tried to move its independent trainers back onto employee sales quotas. She refused. Not because she could not sell: "I'm competitive, so I was always in the top producers in the company." Because of what the quota does to the work: "whenever you're in a gym and you're booked already and you still have to meet a sales quota". She went out on her own instead: "I wanted to be able to provide more in-depth on the nutrition side."

Today she runs her own place: "This is a private studio", no walk-in traffic, in San Antonio near the medical center. It runs on relationships. Her words: "most of my business comes off of referrals".

What are the biggest weight loss myths?

Ask her for the biggest lie in the fitness industry and her first answer is the one most fitness apps are built on: calories in, calories out.

Not that calories are irrelevant. Her point is that the math alone is not the plan: "there's a lot of other factors that you have to take into account than just the calories". She has spent years with a caseload that taught her that; in her words, "I have worked with so many people with hormone issues". And bodies differ: "people respond differently to macros", so she starts with the person, not the formula.

The myth	What Sonia says on camera
Calories in, calories out is the whole game	"sometimes it's not all about the calories"; "people respond differently to macros", so the plan starts with the person
Results should come fast	"we try to do so much on the front end that it's just not sustainable"; the target is "a sustainable lifestyle change"
You have to live like a bodybuilder	the "bodybuilder lifestyle does not fit most people's life"; her job is "meeting that person where they are"

Carbs come up too. She does not treat them as the enemy. The pattern she names is simpler: most people just overeat them, and too much of that intake is processed.

What keeps results, according to 26 years of clients?

Her answer to the quick-fix myth is the closest thing the interview has to a thesis. People believe "the results should come quickly", so they front-load everything, and "we try to do so much on the front end that it's just not sustainable". What she builds instead is "a sustainable lifestyle change", because "that's what's going to keep the results". A second coach in our series diagnoses the training side of the same failure pattern in why most fitness plans fail.

That means fitting the plan to the life, not the life to the plan. The "bodybuilder lifestyle does not fit most people's life", she says, so the real question is "meeting that person where they are": the client with three days a week, the client with a husband and kids who eat differently, the client starting over.

The lesson her clients taught her is the same one: "everybody is different and you have to be able to really work with each person". Her explanation for why it works: "I really do try to listen".

And she holds the line over time. "I'm going to keep them accountable", she says, because "we all have life that happens". The receipt for all of this is not a testimonial. It is tenure: she has clients who have been with her 20 years, and plenty more at 10 and 15.

What happened when her own life got hard?

Sonia says she has never wanted out: "I have never had that feeling that I wanted to quit as a trainer." She describes the work as "truly fulfilling my God-given purpose".

The last few years tested that. She spent them "taking care of my mom that has dementia", scaled the business back, and found herself asking the question every veteran dreads: "am I losing my relevance". Her mom now lives with her sister, a decision she sums up in one line: "I have to focus on my business."

Her account of the restart is short. She is a believer in prayer, and in her telling she "prayed and bam." This January, "six of my old clients", some she had not seen in years, reached out to start again. She keeps "an open door policy", and her old clients know it: "they always know that they can come back".

That is what a referral business looks like after 26 years, and it is the industry norm, not the exception: in Insurance Canopy's survey of personal trainers (fielded September 2024), 69 percent said word-of-mouth referrals are their primary source of new clients.

What should you look for in a personal trainer?

Sonia's hiring advice from the interview fits in three tests:

1. Watch for the crash-plan red flag. A trainer who starts you on "a super restrictive diet"? In her words, "that's a red flag."
2. Weigh experience, not just the certificate. Her advice is to look beyond certification to what the trainer has actually lived through with clients.
3. Ask: "do they practice what they preach?" Her phrase for the whole test. She passes it herself: "I just turned 50", and her explanation is "really adopting the lifestyle and sticking with it". Early in her career she competed in figure and bikini shows, and the discipline stuck: "I thought I can do anything", she says of finishing that first prep; "it really took me to another level".

The fuller version of that checklist is in how to find a personal trainer in Austin, and the no-pressure way to run it is how to choose a personal trainer without signing a contract.

What do her clients walk away with?

Conley closes every interview in this series the same way: if I do my job right, my clients walk away with more than just fitness. They walk away with what?

Her answer: "confidence."

Her elaboration is the best 20 seconds of the video. If she gives clients "the tools to set them up for success", they can "be confident in the gym or when they walk into a restaurant or when they go to the grocery store or when they go for that job interview or they go on that date".

She means it literally. She now teaches dance on the side, mostly country, mostly to men, and tells a story about a client who finally had the confidence to ask for a dance and get the yes.

Sonia trains in San Antonio. The way she thinks is worth borrowing anywhere. If you are hiring in Austin, start with how to find a personal trainer in Austin: open profiles across all Austin personal trainers, visible credentials, a coaching style you can hear in the trainer's own words, and one session booked with no contract.

Trainers: this is the flywheel

Everything above is also a demonstration. Thirty-one filmed minutes did for Sonia what no bio paragraph can: her philosophy, verbatim, in front of every person shopping for exactly her kind of coaching. That is the Get Featured program, and the wider playbook for filling a local book is in how to get personal training clients in Austin.

Frequently asked

Who is Sonia Renee?

Sonia Renee is a personal trainer in San Antonio, near the medical center, coaching since 2000. A former basketball, track, and cheer athlete, she studied psychology and kinesiology, started out in a hospital-based fitness and wellness center, and now runs a private, referral-driven studio. Some of her clients have trained with her for 20 years.

What is the biggest weight loss myth, according to a trainer?

In our filmed interview, Sonia Renee names calories in, calories out. Her words on camera: "sometimes it's not all about the calories." After 26 years of clients she builds each plan around the person instead of a formula, and aims for a sustainable lifestyle change rather than a fast, front-loaded push. That is one experienced coach's professional opinion, not medical advice.

How do I find a trainer like this in Austin?

Look for what you can verify: real credentials, a clear specialty, a coaching style you can see or hear in the trainer's own words, and a session price you can see before you book. Fit Local puts all four on open trainer profiles so you can compare Austin trainers directly and book one session, no contract.