The first source is a blog post on Medium that discusses a fitness philosophy called the Minimum Effective Dose (MED), which advocates for consistent, small, and sustainable efforts in exercise, diet, and lifestyle to achieve long-term health and fitness goals, particularly for people over 40. The second source is a collection of comments from various individuals responding to the blog post, with many readers sharing their personal experiences and insights about the MED approach, confirming its effectiveness and practicality.

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