Build Better Humans | A conversation with Da Rulk - kinesiologist, performance specialist, and Posca advisor.
"Da Rulk" is the kind of person who makes you rethink what training actually means. Not in a motivational-poster way. In the way that after 40 minutes with him, you start to wonder whether everything you thought was hard work might actually just be chapter three.
Da Rulk is a kinesiologist and performance specialist who has spent decades working with people whose performance genuinely matters: special forces operators, professional athletes, Hollywood leads preparing for physically demanding roles. His client list includes Navy SEALs and Chris Hemsworth. His methodology – built on neuroscience and functional movement – has one core premise. The body is a vehicle. Most people are obsessed with building a bigger engine. Almost nobody focuses on learning to drive.
He's now working with Posca Hydrate as a performance advisor. He sat down with Merrick and let the cameras roll.
Who Is Da Rulk?
Da Rulk's background is in kinesiology – the science of human movement – with postgraduate focus on neuroscience. Over the course of a career spanning military, professional sport, and entertainment, he developed Raw Functional Training: a methodology built around movement sequencing, sensory processing, and the relationship between the brain and body under real-world conditions.
He's coached at the highest levels of the US military and the NFL. He worked with Chris Hemsworth on the Centr app. He's the person people call when conventional training stops producing results — or when the stakes are too high to leave performance to chance.
Chapter One Isn't What You Think
"Sensory processing is chapter one. Strength conditioning is chapter three. Most people skip straight to three."
Most training programs begin at the same point: movement, load, output. Da Rulk calls that chapter three.
"Chapter one is sensory processing," he explains. "Our ability to manage the adrenal system and organise the nervous system based on the intake of data from our five primary senses. Chapter two is motor planning – our ability to execute. Strength conditioning is the third chapter. It exists to support the first two, not replace them."
The implication is confronting. Most people who train – even serious athletes – are building from the wrong starting point.
"Most people are so focused on building a bigger engine. But they can't even start the car. There's no coolant. No oil. They don't understand what's running the whole system."
His assessment process reflects this. Before any program begins, he wants to know where a person's mind is. Where they struggle mentally. What happens neurologically when pressure arrives. "There are athletes who are extraordinary — AFL, rugby — but when the big lights come on, they can't perform. That crossover from elite sport to everyday performance is what I'm obsessed with. Because it applies to everyone."
His solution isn't gentle. Deliberate adversity, unpredictable terrain, training that never lets you settle into a rhythm. "Life never lets you build a cadence. So why would you train as if it does?"
The Vehicle Has to Be Fuelled
"Your body is a vehicle. I take premium fuel only."
Da Rulk runs a consistent analogy through his work, and it holds because it's accurate: the body is a vehicle, and most people are running it on the wrong fuel.
They underestimate the input. Food treated as an afterthought. Hydration left to thirst. Caffeine used as a performance strategy rather than what it actually is — the ignition.
"Coffee starts the car. It doesn't keep the engine running all day. That's a different conversation entirely."
The overcaffeinated culture, as he puts it, mistakes stimulation for optimisation. "Caffeine is just masking fatigue. It tricks the body into staying up. It's not making you more effective or efficient."
What actually fuels sustained performance is what most people overlook: electrolytes, proper gut function, the kind of hydration that doesn't flush straight through. "If you don't have the right fluids in the engine, you can't blame the car when it stalls. That was your responsibility."
How He Found Posca Hydrate
A mutual friend put a can in his hand. He tried it.
"The taste profile is incredible. But how I felt after – that was the thing. There's an aspect with Posca that you feel it right away. The nutrients are absorbed so quickly."
Da Rulk has dealt with gut absorption issues for years. A lot goes in, not all of it stays. Posca's hypertonic formulation addresses this directly: the acetic acid from red grape vinegar supports the gut lining, getting minerals into the bloodstream faster and more efficiently than a standard drink would.
"I've always been about efficiency. And Posca is efficient. I'm not just saying it because I'm affiliated. I take it every single day."
He now uses it before flights, pre and post training, and as part of his daily protocol. The benefits compound. "The results of consistent hydration over time — in performance, recovery, sleep – they're extraordinary. One Posca is great. Daily Posca is where things actually change."
In the rapid fire round at the end of the conversation, Merrick asked him to describe Posca in one sentence.
He didn't hesitate: "The best beverage in the world."
Why He's an Advisor
"Posca should be in everyone's daily protocols. In all reality."
— Da Rulk
Posca Hydrate's performance proof pillar isn't about elite athletes using the product. It's about what happens when you give serious people a serious product and let them tell you what they notice.
Da Rulk is exactly that. His endorsement isn't aesthetic – it's grounded in the same logic he applies to everything: what does the evidence say, what does the body actually need, and how do you communicate that to someone living in the real world.
"I work with everyone from Navy SEALs to Hollywood to the person who just wants to perform better at life. They're all competing with themselves. That's who I care about."
That's exactly who Posca Hydrate is for.
Watch the full conversation above. Then try what Da Rulk calls the best beverage in the world.
