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1. Rich Roll - As an ultra-endurance athlete and wellness advocate, Rich Roll's channel is filled with profound discussions on personal transformation, health, and endurance. His in-depth interviews with experts across various fields inspire holistic well-being and self-discovery.

2. Chris Williamson - On his channel, Chris delves into a wide array of topics from productivity to the philosophy of life. His content is designed to challenge your thinking and encourage profound personal growth through insightful discussions and expert interviews.

3. Brian Johnson - Known for his channel Optimize, Brian Johnson distills big ideas from psychology and philosophy into practical wisdom applicable in daily life. His videos are short, insightful, and focused on helping you become the best version of yourself.

4. Ryan Holiday - An author and modern Stoic, Ryan Holiday’s channel focuses on stoic philosophy, obstacles as opportunities, and timeless wisdom. His practical advice is useful for personal resilience and success.

5. Shane Parrish - The brain behind Farnam Street and "The Knowledge Project," Shane Parrish’s channel offers insights on mental models, decision making, and learning from some of the most intelligent and successful people in the world.

6. Alex Hormozi - As an entrepreneur and business coach, Alex’s channel provides valuable advice on business growth strategies, entrepreneurship, and efficiency. His practical approach to business problems also translates into personal productivity and growth tips.

7. Naval Ravikant - While not exclusively a YouTube channel, the appearances and talks by Naval Ravikant are deeply philosophical yet practical. His discussions on wealth, happiness, and personal freedom offer profound insights into living effectively.

8. Impact Theory with Tom Bilyeu - Tom Bilyeu explores mindset and potential through his interviews with world-class thinkers, ranging from business moguls to neuroscientists, making it a fantastic resource for anyone looking to expand their boundaries.

9. Simon Sinek - Best known for his concept of "The Golden Circle" and insights on leadership, Simon Sinek’s channel offers motivation and strategies for becoming a better leader and living with a clear sense of purpose.

10. Tim Ferriss - Author of "The 4-Hour Workweek," Tim Ferriss’s channel dives into life hacks, productivity tips, and interviews with high achievers to uncover their secrets and routines that lead to success.

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Each channel on this list contributes significantly to personal development across various aspects of life, including health, mental well-being, business acumen, and philosophical insights. They are sure to provide valuable content that can help foster growth and personal development in their viewers.