What are some effective ways to structure indoor cycling workouts to build strength and endurance for outdoor riding, and how can you tailor these workouts to target specific muscle groups and address common weaknesses? Are there any particular types of indoor workouts, such as high-intensity interval training (HIIT) or low-cadence strength training, that are more effective for building strength and endurance than others? How can you incorporate strength training exercises off the bike into your indoor cycling routine to further enhance your overall strength and power output? Are there any specific metrics, such as watts per kilogram or functional threshold power, that you should focus on improving through indoor cycling workouts to translate to better outdoor performance? Can indoor cycling workouts be designed to mimic the demands of specific outdoor routes or terrain, such as hills or mountains, and if so, how can you go about doing this? How often should you incorporate indoor cycling workouts into your training routine to see noticeable improvements in strength and endurance for outdoor riding?