TrainerRoad is a training app for cyclists and triathletes focused on getting faster through structured, science-based workouts rather than entertainment or virtual worlds. Its Plan Builder asks for a user's target events, experience, and weekly time available, then generates a full periodized training plan of specific interval workouts leading up to race day, adapting the plan automatically as the athlete completes or misses sessions. Workouts run indoors on a smart trainer with power targets, or can be taken outside with the structure pushed to a head unit, and TrainerRoad's AI, trained on a very large database of planned-versus-actual workout data from hundreds of millions of logged rides, continuously estimates a rider's fitness and adjusts workout difficulty without requiring the traditional all-out fitness tests. It covers road, gravel, mountain biking, cyclocross, gran fondos, triathlon, and general fitness goals, and includes analysis tools, a calendar, and a team feature for coaches. TrainerRoad is aimed at committed amateur athletes who want a coach-like plan at a software price. It is sold as a paid monthly or annual subscription with no free tier, covering the full plan builder, workout library, adaptive training, and analytics.