The marathon long run

No single distance is compulsory. A useful longest run depends on your recent volume, experience, pace, injury history and how well you recover. Some runners are ready for 30 to 32 km; others get the same benefit more safely from a shorter time-based run. The goal is enough specific endurance and confidence without creating a recovery cost that ruins the following week.

Treat the longest run as an individual dose, not a badge. It should grow from the longest run you can already tolerate and fit inside a consistent week. Faster, experienced, high-volume runners may cover more distance in a sensible time; newer or slower runners often need a lower distance or time cap. We look for the smallest dose that builds marathon-specific endurance while leaving you able to recover and train well afterward.

Most long runs should feel controlled enough that you can recover and keep the week intact. Pace depends on your level, terrain, conditions and the purpose of the session. Some later long runs can include planned blocks at marathon effort, but an easy long run does not need to sit close to goal pace to work. Use effort as the final check, especially in heat or on hills.

A controlled block at marathon effort can rehearse rhythm, fuelling and decision-making when the legs are already tired. It is a useful specific session for a runner with enough base, not a requirement for every long run or every athlete. The dose should fit the runner's current volume and recovery, and it should be reduced or removed when pain, fatigue or conditions make the cost too high.

It is generally unnecessary for most marathoners. The recovery cost of a full-distance training run can disrupt the consistency that matters more. Build endurance through accumulated volume, appropriately long runs, selected race-specific work and rehearsed fuelling. Rare exceptions need experienced, individual supervision rather than a generic plan.