HIIT is a builder, not a burner – it builds the powerplants you need to burn. For you as loyal SuppVersity readers, the fact that HIIT is the #1 growth promoter for your mitochondria is no news. That 4×4 minutes of HIIT per week are yet already enough to promote significant increases in the mitochondrial counterpart of mTOR, PGC-1? – the master regulator of mitochondrial biogenesis (Wu. 1999) – will probably still comes as a surprise.

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4×4 Minutes of HIIT Per Week That's All It Takes For Already Well …

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