Leg strength is the #1 predictor of longevity, balance, and independence. When legs weaken, everything else follows—energy, hormones, metabolism, and stability. Training legs twice per week doesn’t just build muscle. It improves testosterone, growth hormone, insulin sensitivity, bone density, and total body strength. And no—you don’t need heavy barbell squats. Joint-friendly machines, split squats, lunges, and presses get the job done. Train your legs consistently and your whole body feels young