Performance. Energy. Recovery.
The ENERGYCORE TRAINER by Optismith.
Your Performance Starts at a Cellular Level
The EnergyCore Trainer is a science-backed breathing device that utilizes Intermittent Hypercapnic Training (IHT-HC) to flood the cells in your body with oxygen so they produce more useable energy (ATP), the key ingredient for your Performance, Recovery and Overall Health.
How it Works
Watch the Video below to see how the EnergyCore Trainer works.
"How are people not talking about this?"
FROM 56 REVIEWS
"I'm a runner and I've used this for 2 months now. It's definitely made a difference to my run times. Will post 6 month update"
"I use the EnergyCore Trainer before my runs. I find it gives me more energy and a
clearer mind."
"I can definitely feel the difference this makes to my training."
It gives me a rush of energy, makes me feel like I’m bouncing off the walls.
The EnergyCore Trainer gives me insane endurance—I recover faster and push harder. My muscles feel energized, not exhausted. 10/10!
I was sceptical but this actually works...
The New Athletic Performance Edge.
The EnergyCore Trainer uses science-backed principles to improve your ability to produce energy (ATP), making it a critical tool for everyday people and athletes alike.
See It In Action
Feel the Difference
- Boost Athletic Performance - The EnergyCore trainer enhances oxygen efficiency, V02 max and improves cellular energy output.
- Energy production - Oxygen allows your mitochondria to produce more energy
- Cognitive function - Greater blood flow and oxygen delivery to the brain.
- Health/longevity - Improved oxygen utilisation, anti-inflammatory signalling.
- Stress resilience - Better CO₂ tolerance = lower baseline anxiety.
- Improved Blood flow - Increases C02 levels which naturally dilates blood vessels and enhances circulation to muscles and vital organs.
- Disease prevention - ,Improved ATP production fuels vital cellular processes like repair, detoxification and immune response, keeping cells functioning optimally and resilient against disease.
The Science
Improve your performance and recovery by up to 10%
Documented studies have shown that when individuals engage in intermittent hypercapnic and Hypoxia training for 4-6 weeks, they can see up to a 10% increase in athletic performance.
The Bohr Effect explains how elevated carbon dioxide (CO₂) levels in the blood result in the release of more oxygen from hemoglobin into tissues, making oxygen more bioavailable to cells. This improves oxygen delivery to tissues, including the brain and muscles, enhancing endurance, focus, and recovery.
ATP(adenosine triphosphate) is the primary energy molecule used by every cell in your body. Hypercapnic training enhances ATP production by improving oxygen delivery (via the Bohr Effect), stimulating mitochondrial biogenesis, and increasing the efficiency of the electron transport chain.
Oxygen is essential for keeping cells healthy, functional, and resilient. It supports immune defence, drives efficient ATP production, and helps eliminate waste. When oxygen levels in tissues are low, known as hypoxia, cells become stressed, inflammation increases, and the risk of chronic disease rises.
Hypercapnic training increases mitochondrial density and efficiency by stimulating mild cellular stress, which activates adaptive pathways like PGC-1α and AMPK. This leads to greater ATP output with less oxygen required, boosting energy, metabolism, and cellular resilience over time.
CO₂ is a natural vasodilator, especially in the brain. As CO₂ levels rise, blood vessels widen, increasing blood flow and delivering more oxygen and nutrients to the brain. This enhanced cerebral perfusion boosts cognitive clarity, mood, and neuroprotection.
Improving oxygen delivery to muscles enhances athletic and physical performance by increasing the availability of oxygen at the cellular level, where it is essential for aerobic metabolism and ATP production. The result is a delay in fatigue, improved endurance, and faster recovery.
Have Questions?
See our FAQs section below or send us an email.
The EnergyCore Trainer allows you to practice Intermittent Hypercapnic breathing to increase the levels of CO₂ in your body. In doing this, your body releases more oxygen from your bloodstream into your cells (known as the Bohr Effect), which allows the mitochondria in your cells to create more usable energy(ATP), the key ingredient required by your body and brain to hit peak performance.
Please check the ‘how it works’ tab of our website for an in-depth explanation of
how. You can navigate there using the menu at the top of this page.
The EnergyCore trainer is ideal for athletes, biohackers, and anyone looking to improve energy, longevity, and athletic performance.
Yes, when used as directed. Hypercapnic training is backed by clinical research and mimics adaptations your body naturally
undergoes at altitude or during high-level physical training. Always start slow
and consult your doctor if you have a respiratory or cardiovascular condition.
Using your EnergyCore Trainer is like training a muscle at the gym. You won't experience results the first time you use it, but you can expect to experience improvements to your physical performance, energy levels and mental clarity after 4-6 weeks of using your EnergyCore Trainer every day.
Unlike basic breathing tools, the EnergyCore Trainer is designed specifically to support hypercapnic conditioning - training your body to tolerate elevated
CO₂ to enhance oxygen delivery, ATP production, and cellular health. Most other breathing trainers on the market instead focus on limiting oxygen delivery.
Not at all. While athletes love the EnergyCore Trainer for the performance gains, anyone can benefit from improved energy metabolism at a cellular level.
Yes! The EnergyCore Trainer is lightweight, compact, and requires no batteries or
electronics. It’s easy to take with you to the gym, the office, or while traveling.
Unfortunately, due to the nature of this being a personal-use health device, we cannot accept returns or issue refunds once the product has been used. This is to ensure hygiene and product integrity for all customers. Please consider this before your purchase.