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This isn’t about looking fit. It’s about staying capable. Nobody warned you this was coming. One day you’re fine, and the next you’re standing up from a chair, thinking, " Why is this harder? It’s not just a long week. It’s sarcopenia—the slow, quiet loss of muscle that begins in your thirties, accelerates after fifty, and usually gets noticed only after something goes wrong. The medical system didn’t warn you. The fitness industry didn’t either. This book does. Not Done Yet is a science-based, no-nonsense guide to building strength, muscle, and real physical health after 50.

You spent the first half of your life proving you could carry anything. The job. The grudge. The title you’re still defending. You got good at it. Too good, maybe. Endurance can’t tell a load that’s building you from one that’s grinding you down. It carries both the same way, and from the inside they feel almost identical. Your toughness is the reason you’re still stuck in the thing you should have left years ago. John C Harris, Navy veteran and wellness coach, spent years calling his own stubbornness a virtue.