What are the most effective interval workouts to incorporate into an indoor cycling routine when the primary goal is to improve speed, and how do they compare to traditional high-cadence drills in terms of their ability to increase leg speed and power output. Specifically, what are the optimal work-to-rest ratios, interval durations, and intensities for these workouts, and how can they be tailored to suit riders with different fitness levels and goals.
Additionally, what role do other types of indoor cycling workouts, such as hill sprints, pro/1/2 intervals, and Tabata-style workouts, play in a speed-focused training program, and how can they be used to complement or replace traditional interval workouts. Are there any specific tools or software that can be used to create and customize these workouts, and are there any drawbacks or limitations to relying solely on indoor cycling workouts to improve speed.