Ava Durgin, Assistant Health Editor, April 20, 2026 — If you have ever finished a workout and felt sharper, calmer, and more energized, there is a good reason. According to an expert, it is not just endorphins; it is your mitochondria.
These tiny structures inside cells generate energy and help regulate inflammation, repair tissues, and send biochemical signals that strengthen the brain and heart. Daria Mochly-Rosen, Ph.D., a Stanford professor and author of The Life Machines, says exercise is one of the most powerful ways to keep mitochondria healthy.
“By exercising, you actually boost the health of the mitochondria everywhere in the body,” Mochly-Rosen said on a health podcast. “The mitochondria in muscle release factors that help your brain, your heart, and your kidneys. So, when you move, you are not just helping your muscles—you are supporting your whole system.”
Mitochondria produce ATP, the molecule that powers everything from muscle contractions to hormone production. They are dynamic, constantly repairing and dividing to meet the body’s energy needs. Exercise is a highly effective stimulus for this renewal process.
Challenging the body through strength training or cardio signals mitochondria to upgrade. Over time, they can increase in number and efficiency, improving how cells use oxygen and generate energy.
“Exercise doesn’t just make you stronger. It makes your mitochondria stronger, and that translates into better resilience everywhere in the body,” Mochly-Rosen said.
Research supports this. Studies have found that both endurance and resistance exercise stimulate mitochondrial biogenesis, which is the creation of new mitochondria, and enhance the function of existing ones. Other research indicates that aerobic exercise helps regulate mitochondrial dynamics, which can keep cells youthful and reduce oxidative stress linked to cardiovascular disease.
The Most Effective Exercise Routine
For the best results for mitochondrial health, a hybrid approach is recommended by Mochly-Rosen and emerging research.
First, combine endurance and resistance training. Aerobic activities like brisk walking, cycling, or swimming enhance cells’ oxygen efficiency. Resistance training triggers muscle growth and mitochondrial expansion. Together, they support cellular energy and longevity.
Second, stay consistent, not extreme. Long, punishing workouts are not necessary. Research shows that even short bouts of movement throughout the day can boost mitochondrial function. This could mean 20 to 30 minutes of moderate activity, three to five times per week.
Third, move for your brain and heart, too. Mitochondria in muscle tissue release signaling molecules called myokines that support the brain, heart, and kidneys. Regular exercise communicates with organs, strengthening overall health in ways that go beyond physique or stamina.
Fourth, prioritize recovery. Mitochondria repair themselves during rest. Sleep, hydration, and balanced nutrition help sustain the benefits of exercise and maintain mitochondrial resilience over time.
The key takeaway is that you do not need to chase perfection or overtrain to get cellular benefits from exercise. Consistency and balance matter most. Whether it is a brisk walk, a yoga session, or strength training, moving invests in your mitochondria. In turn, they fuel energy, protect the brain and heart, and support long-term resilience.
The information is based on available research, including studies on exercise and mitochondrial biogenesis and dynamics.
