How can you effectively utilize Zwifts advanced race scheduling to create a periodized training plan that integrates interval workouts, hill repeats, and endurance rides, while also allowing for flexibility and adjustments based on real-time performance data and athlete feedback, and what are the key metrics and data points that Zwifts scheduling algorithm uses to optimize the training plan and provide personalized recommendations for improvement, and how do these metrics and data points differ from those used in traditional training planning methods, and what are the potential benefits and limitations of using Zwifts advanced race scheduling compared to other digital training platforms and traditional coaching methods, and how can coaches and athletes leverage Zwifts scheduling features to create a truly personalized and adaptive training plan that takes into account the complexities and nuances of real-world racing and competition, and what role do you think Zwifts advanced race scheduling will play in the future of endurance sports training and competition, and how will it impact the way coaches and athletes approach training and preparation, and what are the potential implications for the sport as a whole.