A half marathon covers 21.0975 km (13.1094 miles), exactly half the marathon distance, according to World Athletics in its discipline page. This FAQ explains how to pace it evenly, fuel during the run, and eat to recover after. The advice suits healthy recreational runners preparing for a first or next race. It focuses on decisions you can control on race day.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What does the distance demand?
- How should you pace 21.1 km?
- How do you fuel during the race?
- What should you eat after the finish?
What does the distance demand?
The half marathon rewards steady energy use from start to finish. You run far enough that early mistakes carry a cost late in the race.
That makes control more important than courage. A calm first half leaves you able to hold form when fatigue builds.
How should you pace 21.1 km?
Even pacing produces the best outcomes, while most recreational runners slow in the second half, PLOS ONE reports in its PLOS ONE large-scale split-time study. Slowing late is called positive-splitting, meaning the second half is slower than the first.
Start at a pace you can maintain, not a pace you hope to survive. Check your effort at several points and resist surges on downhills or with crowds.
How do you fuel during the race?
For continuous exercise over 60 minutes, athletes should consume 30-60 g of carbohydrate per hour plus fluid to maintain blood glucose, the U.S. Coast Guard states in its Nutrition for Sports Performance guide.
That rule directly guides half-marathon fueling. Pick products you have tested in training. Common options include sports drink, gel, chews, or banana pieces with water.
- Take fuel early, before you feel empty.
- Sip fluid at regular stations.
- Adjust intake if your stomach feels uneasy.
What should you eat after the finish?
After a half marathon, runners should eat carbohydrates plus 20-30 g protein within 30-60 minutes, roughly a 3:1 to 4:1 carb-to-protein ratio, to restore glycogen and repair muscle, American Sport and Fitness Association explains in its sports-nutrition guidance. Prompt eating supports recovery better than waiting hours.
Choose a familiar meal or snack that combines both nutrients. Keep drinking fluid and take an easy walk before sitting for long. Pack that snack before the start so you can eat promptly at the finish.
- Chocolate milk with a bagel.
- Rice bowl with chicken and vegetables.
- Yogurt with fruit and granola.