How Essential Amino Acids Support Muscle Health and Energy After 40 Muscle loss after 40 is common, but not inevitable. Learn how strength training, recovery strategies, and proper nutrition help active adults stay strong and energized. Strength Training Over 40: Why Muscle Loss Happens — and How to Stay Strong For many active adults, turning 40 doesn’t mean slowing down — but it often brings noticeable changes in strength, recovery, and energy levels. Workouts may feel more demanding. Recovery may take longer. Gains may come more slowly. This isn’t a motivation issue. It’s physiology. Understanding what happens inside the body after 40 is essential for maintaining performance, muscle mass, and long-term health. The Science Behind Muscle Loss After 40 Beginning around age 30, adults gradually lose lean muscle mass. After 40, this decline can accelerate — especially without consistent resistance training. This age-related muscle loss is known as...