Does HIIT actually make a difference, or is it overhyped?

High-intensity interval training (HIIT) is supported by several meta-analyses and randomized controlled trials showing improvements in cardiorespiratory fitness and body composition, including in clinical populations such as people with rheumatoid arthritis, stroke survivors, and adolescents with obesity. Weighing the data: HIIT looks well-supported and consequential — the evidence is rated strong (75/100) and its estimated impact on longevity is also rated highly (65/100), making it one of the more solidly-backed choices on Vitaebase.