What specific workout protocols and training metrics should be prioritized on an indoor trainer to effectively simulate the demands of an outdoor hilly or mountainous road race, and are there any particular considerations for translating watts-based training to varied outdoor terrain and elevations. How do trainers with virtual routes or simulated elevation changes compare to those without in terms of preparing riders for real-world climbing and descending scenarios. Are there any notable differences in training approach for riders targeting shorter, punchier climbs versus longer, more sustained mountain ascents. What role should heart rate monitoring play in these workouts, and are there any specific heart rate-based training zones or protocols that are particularly well-suited to indoor trainer workouts aimed at outdoor hill climbing preparation.