Heavy Legs While Running: Why It Happens (And How To Fix It)

<p><b>Why do your legs suddenly feel heavy during a run—even when your fitness is improving?</b></p><p>This is one of the most frustrating and misunderstood experiences in running. One minute you feel smooth and in control… and the next, your legs feel like bricks.</p><p><i>This episode is grounded in exercise physiology and real-world training principles.</i></p><p>In this episode, <b>Coach Chris</b> and <b>Coach Maya</b> break down exactly why this happens—and how to fix it.</p><p><b>We cover:</b></p><ul><li>⚡ How glycogen depletion impacts muscle force and perceived effort</li><li>💧 Why electrolyte imbalance (especially sodium) disrupts muscle contraction</li><li>🧠 The role of neuromuscular fatigue and the brain’s “central governor”</li><li>🔧 A simple system to prevent heavy legs before, during, and after your runs</li></ul><p><b>🔗 Start Here: The Injury-Proof Half Marathon System</b><br>Download our free 14-week training plan and learn how to structure your training, fueling, and recovery: <a href="https://halfmarathontrainingplan.com/start">halfmarathontrainingplan.com/start</a></p><p><b>📚 Learn More:</b></p><ul><li><a href="https://halfmarathontrainingplan.com/injury-prevention/how-to-avoid-shin-splints/">How to Avoid Shin Splints</a></li><li><a href="https://halfmarathontrainingplan.com/nutrition/fueling-long-runs/">Fueling Long Runs</a></li><li><a href="https://halfmarathontrainingplan.com/nutrition/electrolytes-for-runners/">Electrolytes for Runners</a></li></ul><p><i>This has been a production of the Half Marathon Training Plan Podcast. Visit <a href="https://halfmarathontrainingplan.com/">HalfMarathonTrainingPlan.com</a> for more science-based training guidance.</i></p>