The
long run

The long run is the most important workout of the week for any runner preparing for races of 10K or longer. It's where your body learns to use fat as fuel, strengthens the cardiovascular system and develops the mental resilience to endure long distances.

The science is clear: long runs at easy pace increase mitochondrial density in muscles, improve capillarization (more blood vessels supplying the muscles) and teach the body to be more efficient with energy. These adaptations take weeks and months to consolidate — that's why consistency is key.

The long run is also the time to practice race-day nutrition and hydration. Figuring out what your stomach tolerates during effort is just as important as training your legs.

Long run pace should be comfortable — between 60-90 seconds slower than your race pace. You should be able to hold a normal conversation throughout the entire run. If you're out of breath, you're going too fast. The goal isn't to train speed, but time on feet.

The ideal distance depends on your goal: for 10K, long runs of 12-16km are enough. For half marathon, aim for 18-20km. For marathon, long runs range from 25 to 35km depending on the methodology. Increase gradually — max 10% per week.

Do the long run on the same day each week (usually Saturday or Sunday), rest the day before and the day after. Hydrate every 20-30 minutes and practice the nutrition you'll use on race day (gels, bananas, maltodextrin).