Zone 2 cardio vs. HIIT on TRT: Which is better for fat loss?

When optimizing body composition on testosterone replacement therapy, both Zone 2 cardio and HIIT serve distinct purposes, but Zone 2 is generally superior for sustainable fat loss and mitochondrial health without overstressing your central nervous system. While HIIT provides a strong short-term metabolic stimulus, excessive high-intensity work when combined with TRT-driven recovery can elevate cortisol and hinder optimal fat oxidation. At HeydayMD, our clinical team helps you integrate targeted cardiovascular programming alongside your custom hormone protocol to maximize fat loss while preserving hard-earned lean muscle mass.