HIIT

High-intensity interval training: short (30 s–4 min) near-maximal bouts with rests. The most efficient way to raise VO2max; the “Norwegian 4×4” (4×4 min at 90%) is the best-studied form.

Last reviewed: 6 September 2026

This site is educational and does not replace medical advice. Start any supplement or drug only after consulting a doctor or pharmacist.