Beginner-friendly 25-minute cardio starter aims to boost longevity, trainer says

A longevity-focused trainer says VO2 max is the key predictor of aging well and recommends a beginner-friendly Zone 2 cardio plan: 20–30 minutes of brisk walking, light jogging, cycling, or swimming three times weekly at about 60–70% of max and at a pace where you can talk in full sentences; after six to eight weeks, add short intervals while pairing cardio with strength training to preserve muscle and improve oxygen use.