Is HIIT worth prioritizing?

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 that against the numbers, HIIT is a strong candidate to prioritize — it combines strong evidence (75/100) with a high estimated impact on longevity (65/100).