Building Your Engine: A Guide to Mitochondria and Performance

At REBEL Elite Fitness, we believe that the best equipment in the world is only as effective as the athlete using it. While we provide the tools to build your strength, the single biggest factor in your actual performance is efficiency: how well your body produces and supplies energy to your working muscles.

To maximise this efficiency, you need a high-functioning network of mitochondria—often called the “powerhouses of the cell.”

What are Mitochondria?

Mitochondria are microscopic organelles found in almost all of the body’s cells. In high-demand environments like your muscle tissue, cells can contain hundreds or even thousands of them. Their primary role is energy production, specifically the generation of Adenosine Triphosphate (ATP), the body’s universal energy currency.

Through complex chemical processes, mitochondria utilise the oxygen you breathe and the nutrients you consume to produce ATP. This fuels everything from basic biological functions to the most grueling metabolic conditioning sessions.

Why Quality Matters

The number, size, and quality of your mitochondria are the foundation of your aerobic capacity. The more efficient your mitochondria are, the more energy you can produce.

This results in:

Higher Power Output: Sustaining more work for longer.

Improved Efficiency: Performing at the same level with a lower perceived exertion.

While genetics play a role in your baseline, mitochondrial health is highly adaptable. Research consistently shows that intentional training is the best way to increase both the quantity and the quality of these energy-producing units.

Training for Adaptation: Number vs. Size

To build a truly elite engine, you need to understand how different training stimuli affect your cellular makeup. Like choosing the right barbell for a lift, you must choose the right intensity for the desired adaptation:

Low-Intensity Training: Increases the number of mitochondria in the cells.

High-Intensity Training: Increases the size and capacity of existing mitochondria.

The Power Plant Analogy:

To supply more energy to a city, you can either build more power plants (quantity) or increase the output capacity of existing ones (quality). To be a truly well-rounded athlete, you want to do both.

Don’t neglect the “slow” work, and don’t shy away from the “fast” work. By incorporating a mix of low-intensity aerobic sessions and high-intensity intervals, you ensure your body has a vast, high-capacity engine capable of powering through any challenge.