Zone 2 cardio is steady, low-intensity aerobic exercise. Learn how to estimate effort with heart-rate ranges, the talk test, and perceived exertion, then build a gradual routine after 45.
10–30 minutes of morning sunlight can reset your circadian rhythm, boost cortisol, and improve sleep. Discover the science behind this simple longevity habit.
Your biological age may be younger — or older — than your birth year. Learn what biological age means, how it’s measured, and how to lower it with proven habits.
