Okay, so I need to write an article about how to improve bone density. Let me start by understanding the user's requirements. They want an original article, 600 to 900 words, with natural headings. I should avoid unsupported claims and not mention that it's AI-generated. The context provided includes some keywords and links, but I need to make sure I don't just copy those. First, I should outline the main sections. The user mentioned bone remodeling and exercise types, so maybe start with an introduction explaining why bone density is important. Then, cover key strategies like exercise, nutrition, lifestyle factors, and maybe some tips for specific groups like postmenopausal women or older adults. The context has a video mention, a free guide, Dr. Jen Ashton's answers, and some product names like Brick House Bones. I should integrate these but not just list them. Perhaps in the conclusion or as resources. Also, the user wants natural headings, so I need to come up with subheadings that are informative and not forced. I need to ensure that the information is accurate. For example, when discussing exercise, I should mention weight-bearing and resistance exercises. Nutrition-wise, calcium and vitamin D are crucial. Lifestyle factors like smoking and alcohol should be addressed. Maybe include a section on weight management since excess weight can be good for bone density but too much is bad. Wait, the user provided some links. I should check if those are relevant. The free guide is about strength exercises after 50, which fits well in the exercise section. Dr. Jen Ashton's video could be a resource for Q&A, so maybe mention her in the context of expert advice. Brick House Bones might be a program, so perhaps use it as an example of evidence-based exercise. I need to avoid unsupported claims. So, when talking about exercise, I should reference studies or general scientific consensus, not make up specific results. For example, say "research shows" instead of "studies prove." Let me structure the article: 1. Introduction: Importance of bone density, common issues like osteoporosis. 2. How Bone Remodeling Works: Brief explanation of the process. 3. Key Strategies to Improve Bone Density: a. Weight-Bearing and Resistance Exercises b. Nutrition: Calcium, Vitamin D, Protein c. Lifestyle Factors: Smoking, Alcohol, Sleep d. Weight Management 4. Special Considerations: Postmenopausal Women, Older Adults 5. Conclusion and Resources: Mention the free guide, Dr. Ashton's video, Brick House Bones. Wait, the user's context includes "Brick House Bones®: Evidence-Based Exercise for..." so I can use that as an example of a program. Maybe in the exercise section. I need to make sure the tone is informative but not too technical. Use bullet points or lists where necessary, but since the user wants HTML, I can use ul/li tags. But the user said to use h2, h3, p, ul, ol, li, strong, and em tags. So no markdown, just HTML. Let me start drafting each section. Introduction: Start with a hook, maybe mention that bone density is crucial for preventing fractures, especially as we age. Then introduce the strategies. Bone Remodeling: Explain that bones are constantly being broken down and rebuilt. Exercise can influence this process by promoting bone formation. Exercise Section: Break down into weight-bearing (walking, running) and resistance (weights, resistance bands). Mention specific examples. Maybe cite the free guide for exercises after 50. Nutrition: Calcium sources (dairy, leafy greens), vitamin D (sunlight, supplements), protein. Mention the importance of adequate intake. Lifestyle: Smoking and alcohol negatively affect bone health. Sleep is important for growth hormone release. Weight Management: Not underweight or obese. Maybe a BMI between 20-25. Special Considerations: Hormonal changes in postmenopausal women affect bone density. Maybe suggest consulting healthcare providers for personalized plans. Conclusion: Summarize the key points and direct readers to the resources mentioned. Now, check for word count. Need to ensure it's between 60