Body & HealthFact

Endurance training builds new power plants into your cells.

Mitochondria are the cell's power plants; using oxygen, they turn sugar and fat into the energy carrier ATP. Regular endurance exercise activates the regulator PGC-1α, which instructs the cell to build more and larger mitochondria. Within about 6 weeks their density in muscle can rise markedly. The result: you burn more fat at the same pace and tire later.

Useful: The effect is reversible: after weeks without training, mitochondrial numbers shrink again.

Source: en.wikipedia.org

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