Keir, your insights on fitness for dads over 40 are a game-changer. Your approach, grounded in the role of testosterone and its holistic impact, makes this more than just a fitness guide – it's a manual for reclaiming vitality.

The emphasis on strength training as a "Testosterone Turbo-Charger" is spot-on. It's refreshing to see the focus on functional strength rather than generic workouts. The HIIT and Zone 2 Cardio balance, coupled with practical integration into daily activities, is a practical solution for busy dads.

Your acknowledgment of flexibility and mobility as the "Fountain of Youth" is crucial. Many overlook these aspects, and your seven-minute mobility workout is a gem. The nutritional guidance, especially the 80/20 rule and prioritizing protein and fiber, is both realistic and attainable.

Sleep as the "Unsung Hero" resonates deeply. Your challenge to prioritize quality sleep, even amid dad responsibilities, is a call to action. Stress management, framed as a tool for growth, is a nuanced perspective that shifts the narrative around stress.

The concluding action steps provide a clear roadmap for dads looking to defy the conventional aging narrative. Your comprehensive and well-referenced guide is a valuable resource. Thanks for empowering dads to take charge of their well-being and be the superheroes their kids see them as! 💪👨‍👧‍👦