Everything in your body that isn't fat.
Think of your Lean Body Mass as your 'inner strength.' It includes your hardworking muscles, your resilient bones, and your life-sustaining water. This is the part of your weight that powers your movement and keeps your metabolism buzzing.
When you're on a health journey, the goal is often to protect this number. Preserving your lean mass while losing fat is the secret to feeling strong, energetic, and keeping the weight off for good.