About BellyProof

By Jacob Nadav and Robert Blundy, BellyProof co-founders · Updated 2 May 2026 · Editorial review by Robert Blundy

Have you ever noticed that what you've been told doesn't quite make sense?

• Eat less to be in a calorie deficit, and eat more to boost your metabolism. Both at once, somehow.
• Measure the calories in everything you eat and burn, even though it's not actually possible to measure either accurately.
• You need ultra-low body fat to see abs, even though plenty of marathon runners are under 10% body fat with no abs at all.
• You can't eat any junk food and stay lean, even though most teenagers manage it without thinking about it.
• Eat thermogenic foods to "boost your metabolism and burn fat through heat," yet your belly stays freezing cold and exactly where it was.

If any of those have been bothering you for years, you're not the problem. The advice is the problem.

You've probably been around this block before. The fitness book that sounded brilliant but never quite translated. The YouTuber whose physique was real but whose advice somehow didn't move yours. The physio with every certification who'd never trained for the body you're trying to build. The nutritionist who'd never tried to lose weight themselves. The gap between what those people say and what your body actually does is exactly where most people get stuck. Most of the industry is teaching things it hasn't lived.

Bellyproof is two people who have lived this. We've trained for decades, between us. We've coached real people from total beginners through to elite athletes, and we know what training actually looks like and feels like, including how intimidating a gym can feel when you've never set foot in one. We know the mental loops the industry creates. We also know the science deeply enough to know which parts of it actually move the needle and which parts are noise.

What you get from Bellyproof is real fitness, real experience with real people, and a level of targeted, mechanism-led science most programs don't bother with, packaged into something you'd actually follow, as a real person, in a real gym.

The brand is in the shape it is because of two people. The science is why it works on your body. The craft is why it works on your week.

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Why Bellyproof exists

Bellyproof LTD wasn't built in a day. It came out of years of watching the same patterns repeat in this industry. Personal trainers cheerfully creating pain in their clients. Young professionals leaving formal education with confident answers to questions nobody had properly asked. Old, unproven theories about metabolism and mobility taught as if they were facts. Marketing claims dressed up as science. The whole thing more interested in how someone looks in front of a camera than in whether their body is actually working.

Throughout the early stages of our own education, we kept coming back to the same question. We'd ask it constantly and either get no answer or get an answer that fell apart on closer inspection. The question was but why?

Bellyproof is for the people who've already noticed how broken this is and want a different approach. One that takes current research seriously, isn't afraid to ask uncomfortable questions, and doesn't dodge the parts where the conventional wisdom contradicts itself. We turned that approach into a workable framework you can actually follow, with the mechanisms explained so you understand what you're doing and why.

The promise is simple. We will show you what the industry says, why it doesn't make sense, and exactly what to do instead. The fat in the spots everyone else has decided are stubborn is fat that responds to the right protocol. We will get you there, and you will know why it worked.

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Our mission

Bellyproof exists to give you a fat-loss program that finally makes sense, and to make sense of the questions you've been carrying about calories, metabolism, cardio, and weights. We don't just want you to lose fat faster. We want you to understand why, so the knowledge stays with you for life.

On mobility, we want you to understand why your body's ability to move freely matters as much as how it looks. The approach is grounded in current science and gives you real insight into your own movement instead of generic stretches.

We don't take shortcuts on what we offer. The goal is something you'll actually use, follow, and be proud of when it works. There's nothing more powerful than taking charge of your own body transformation when you have the science, the tools, and a clear path to follow.

We want to change the way people approach body fat and body composition, one success story at a time.

Welcome to something better.

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Meet the two of us

Jacob Nadav and Robert Blundy, founders.

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Jacob Nadav, Co-Founder, Research & Programming

Jacob is the research and programming half of Bellyproof. He has fifteen years of coaching experience working with athletes, dancers, models, and people across the full spectrum of body composition goals, and he leads the mechanism-science work that underpins every Bellyproof program. Most of the protocol mistakes you could make with a science-led program have already been spotted on someone else first, and the program absorbs those lessons before they ever reach you. That is the practical value of fifteen years of coaching: a shorter learning curve than the one most people walk alone.

Background: Fifteen years coaching, primarily with athletes, dancers, performers, and people who care a lot about how their bodies move and look. The work has spanned beginners trying to lose their first ten kilograms through to advanced trainees prepping for stage. Jacob's research focus is mechanism science: lipolysis, metabolic signalling, the five hypertrophy pathways, the catecholamine cascade, and the longevity research that informs Club Mitochondria. The point of going this deep into the science isn't to impress anyone. It's so the protocols you follow are built on the parts of the research that actually translate to results.

Training: Jacob has trained his whole adult life, primarily in calisthenics and mobility work. The protocols in the program have been tested on his own body before they reach yours. None of this is theoretical for him.

Certifications:

• Functional Range Conditioning (FRC) Practitioner
• ELDOA (Longitudinal Osteoarticular Decoaptation) Certified
• Functional Movement Screen (FMS) Level 2
• Level 3 Personal Training Certification (UK Ofqual-regulated)
• Fifteen years of clinical coaching experience

What Jacob looks after:

• The research engine. Every claim in a Bellyproof program traces back to a mechanism Jacob has studied directly, not a wellness blog summary.
• The protocols. The programs are designed by Jacob from first principles, then refined over years of real-world coaching.
• The science you read. The articles on the site are written by Jacob and reviewed by Rob for clarity before they ship.
• The exercise library. Jacob and Rob co-present every program video, demonstrating the work alongside each other so you see two real bodies doing it, not a model paid for the day.

Find Jacob: LinkedIn

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Robert Blundy, Co-Founder, Creative Director & Nutrition

Rob is the creative and nutrition half of Bellyproof. He looks after almost everything you'll see, hear, and read on Bellyproof that isn't a research citation. The visual identity, the layout of every page, the original music in every video, the recipes that go alongside the program, and the tone of every email that lands in your inbox. He also reads everything Jacob writes before it ships, so what you actually read is calibrated for clarity, not for the inside of a coach's head.

Background: Rob came to fitness through twenty-five years of training in his own life and a career that's spanned design, music composition, and managing a business that served high-profile clients across the performance world. The fitness industry feels intimidating to most people walking in. Rob spends a lot of his time on the parts of Bellyproof that quietly remove that intimidation. The reason the program feels approachable instead of clinical isn't an accident. It's Rob's job.

Training: Rob has trained for over twenty-five years across multiple disciplines, primarily weights and resistance training. The program isn't an abstraction for him. It's how he's lived for two and a half decades.

Certifications:

• Level 2 Fitness Instructor
• Years of practical kitchen craft and applied nutrition experience
• Twenty-five years of personal training across multiple disciplines

What Rob looks after:

• Brand and visual identity. The Bellyproof look, layouts, and graphic system are designed jointly with Jacob, with Rob leading on the visual side.
• Original music. Every track in the Bellyproof video library is composed by Rob.
• Nutrition and kitchen craft. The recipe library and the practical food guidance in the programs come out of years of Rob actually cooking and eating this way. Food first, supplements distant second.
• Editorial review. Every article, program, and piece of copy is reviewed by Rob before it ships. He catches what doesn't land, where the writing is messy, and where the user experience can be cleaner. What you actually read is the version Rob signed off on.
• Co-presenter. Rob appears alongside Jacob in every Bellyproof program video, demonstrating exercises 50/50 across the library.

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Our research approach, in plain language

We don't conduct original studies. What we do is read existing research carefully, work out which parts actually translate to a real human body in a real gym, and build programs around those parts. Most of the fitness industry skips the second step, which is why so much of the advice you've encountered sounds plausible but doesn't move your body.

Our actual approach:

• We look at multiple studies on each topic, never one cherry-picked paper.
• We test the protocols ourselves, and on real clients over months and years, before we build them into a program.
• We're transparent about what we're doing, including when the research contradicts something we used to believe.
• We update what we recommend as new evidence emerges. The program you join in 2026 isn't the program from 2018, and that's deliberate.

The areas Jacob has gone deepest on, and the articles where you can read the work directly:

• Lipolysis and beta-oxidation, the actual mechanism by which fat leaves the body.
• Alpha-2 receptor density and why belly fat resists the protocols that move arm and leg fat easily.
• Flank-specific biology, microvascular perfusion, and the 20-minute lipolytic threshold that flank tissue actually requires.
• Visceral fat and why it behaves differently from the fat you can see.
• The five hypertrophy pathways and how they interact with fat-loss protocols.
• Cold exposure, brown adipose tissue, and what the research actually supports versus what the marketing claims.
• Intermittent fasting and the LION protocol that came out of years of testing different fasting windows.

If a topic in a Bellyproof program is interesting to you and you want the underlying mechanism, the science article on it is free, public, and written by the same person who designed the protocol.

We are not medical doctors and we're not telling anyone to ignore one. If you have a medical condition, talk to a healthcare provider as well as following the program. We're not researchers conducting original studies, and we don't claim to have discovered new physiological mechanisms. We're coaches who read deeply and apply carefully.

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What we sell, and what we don't take money from

We sell Bellyproof programs. That's how the business runs. We separate clearly between the free educational content on the site (the articles, the science explainers, the program-overview pages) and the paid programs (which is where the protocols, the videos, the personalised recipes, and the structured weeks live).

We don't take money from supplement companies. We don't take money from equipment manufacturers. We don't run affiliate links. What we recommend is recommended because we believe it helps you, not because somebody paid us to mention it.

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Talk to us

If anything on this page or in any of the programs is unclear, or if you just want to ask a question before you commit to anything, write to us. You'll get a reply directly from Jacob or Rob. Not from a support team, not from a ticket system, not from "we'll get back to you in 24 to 48 hours." Just one of us, usually within the hour, sometimes faster, and we like hearing from people. There's no question too small.