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9mo
Research published in the Journal of Applied Physiology shows that short, high-intensity sprint intervals can dramatically increase human growth hormone (HGH) levels — in some cases by up to 771% compared to baseline. HGH - often called the "youth hormone" — plays a critical role in muscle repair, fat metabolism, and anti-aging. Unlike long steady-state cardio, which can elevate cortisol and blunt anabolic hormones, all-out sprints create a powerful metabolic stress that stimulates HGH release. In one study, performing 6x30-second maximal sprints with 90-120 seconds of rest between efforts yielded the largest acute HGH spike ever recorded from exercise alone. Faster fat loss Greater muscle growth Improved recovery Slower aging Key takeaway: Quality beats quantity. Go all-out during those 30 seconds — that's where the hormone response happens. See more comments
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