Hypoxia

Altitude training—or hypoxic training—is not a placebo and it’s not marketing. Air-restricting masks, which are plastered all over Instagram Stories, have nothing to do with altitude training. Real hypoxia is a different story. A new study shows that it rewrites mitochondrial gene expression within 24 hours after a single HIIT session. What bioRxiv, Li et al., April 2026, have done. 10...