Training for a half marathon with Type 1 diabetes comes with unique challenges that go beyond the typical runner’s concerns. From personal experience, one of the most crucial aspects is managing your insulin on board (IOB) during training and races. Too much insulin can send your blood sugar plummeting, potentially leading to hypoglycemia, which is both dangerous and performance-disrupting. Conversely, insufficient insulin can cause hyperglycemia, resulting in fatigue and discomfort. Pacing is another critical lesson. It’s tempting to start fast, especially on race day or during a good training session, but going out too quickly can cause blood sugar swings and exhaustion. I learned the hard way that maintaining a consistent, manageable pace not only preserves energy but also helps keep glucose levels stable. Using a continuous glucose monitor (CGM) during runs has been a game-changer, providing real-time data to adjust nutrition and insulin needs on the fly. Nutrition plays a key role as well — carrying easy-to-consume carbs like gels, chews, or glucose tablets is a must for managing lows. Trial and error is part of the journey: testing what foods work best before and during runs, how insulin dosing timing affects your energy, and the ideal balance to keep your body fueled without spikes. Above all, the mental game is vital. Training with a chronic illness demands patience and flexibility. Some days may not go as planned due to glucose fluctuations or fatigue, but embracing these moments and learning from them helps build resilience. Connecting with other athletes managing Type 1 diabetes can provide support and shared strategies. Ultimately, running a half marathon with Type 1 diabetes is achievable with careful planning, self-awareness, and adaptive strategies. The experience has taught me invaluable lessons about pacing, insulin management, and perseverance that extend far beyond running. If you’re embarking on this journey, remember to prioritize your health first and celebrate every milestone along the way.