Strength training—not cardio—is your secret weapon for energy, longevity, and independence. Dr. Andy Galpin reveals why muscle protects your brain and bones; Dave Asprey shows how 5 minutes, 3 times weekly beats hours of cardio; Senada Greca explains why strength is the foundation of aging well. This isn't about aesthetics—it's about living pain-free and capable into your 70s and 80s. Physical strength is one of the single strongest predictors of lifespan and mortality, with leg and grip strength being more reliable indicators than VO₂ max in many studies.