AI Endurance builds personalized training plans for runners, cyclists, and triathletes using a neural network trained on the athlete's own workout data. The platform learns how each athlete responds to training and re-optimizes the plan after every session, with recovery tracking, durability analysis, nutrition targets, and an AI coach. It integrates with devices and platforms such as Garmin, Strava, Zwift, and TrainingPeaks, and offers an MCP server for connecting training data to AI assistants like ChatGPT and Claude.