The long run is often boiled down to one rule: run for a long time, at an easy pace. In reality it is one of the richest workouts in any endurance programme, as long as you know what to put into it. It touches on physiology, nutrition, mental management and even your choice of kit. Here is how to get the most out of it, with the advice our coaches use with their athletes every week.
The long run: far more than kilometres. Our 7 coaching secrets.
Reading time: ~6 min
- What a long run really is
- Secret 1: get the intensity right
- Secret 2: build in pace blocks on purpose
- Secret 3: test your nutrition and hydration for real
- Secret 4: use the workout to test your kit
- Secret 5: progress without getting injured
- Secret 6: prepare your recovery from the moment you stop
- Secret 7: work on the mental side
- Do and don’t
- FAQ
- The long run, far more than an endurance workout
What a long run really is
A relative definition
A long run is not defined by a fixed number of kilometres. It is defined relative to your own habits: it is an outing longer than your usual workouts, run mostly at low intensity. That nuance matters, because it means a beginner’s long run and an experienced runner’s long run do not last the same time but follow the same logic.
The physiological and mental benefits
Physiologically, this workout builds general endurance, improves the use of fat as an energy source, and strengthens muscles, tendons and joints against the demands of prolonged effort. It also improves running economy, meaning your ability to move with less energy spent at a given pace. These adaptations take time and only happen with regular exposure to this kind of effort.
The psychological side is just as real. Getting used to running for a long time, managing discomfort, holding a steady pace when your legs start to weigh: all of that can be trained, and the long endurance run is the ideal ground for it.
Secret 1: get the intensity right
Stay in the right effort zone
This is the most common mistake. Setting off too fast turns a long run into a badly dosed tempo session, with all the risks that brings (accumulated fatigue, insufficient recovery, injury). The target zone sits around 65 to 75% of maximum heart rate, which corresponds to a pace where conversation stays easy.
Some programmes include blocks at a moderate pace in certain stretches, around 80 to 90% of maximum heart rate, but those phases stay short and targeted. They are there to simulate race conditions, not to replace the base work.
Secret 2: build in pace blocks on purpose
A well-built long run is not one uniform block. Experienced coaches slip variations into it: a few kilometres at marathon pace towards the end, a block at half marathon pace in the middle section, or progressive accelerations over the last few minutes. Those blocks have a precise objective: teaching the body to change gear when it is already tired, which is exactly what happens in a race.
Structuring the run that way turns it into a tool of specific preparation, well beyond simple mileage.
Secret 3: test your nutrition and hydration for real
Validate your nutrition strategy
The long run is the best moment to validate your nutrition strategy before a race. What you eat and drink during the effort has to be tested in training, never on race day. Gels, bars, sports drinks, solid food: everyone reacts differently, and only doing it for real tells you how.
Plan your hydration and your recovery
Hydration should be planned, not endured. Setting off with a plan (when to drink, how much, what) and adjusting it to conditions is a skill you develop. After the effort, the nutritional recovery window is short: within the hour after the workout, carbohydrates combined with around 20 grams of protein help rebuild glycogen and repair muscle.
Secret 4: use the workout to test your kit
Blisters, chafing, shoes that hurt at the 25th kilometre: all of that gets discovered in training, not in a race. The long run is your chance to validate your shoes, socks, clothing, anti-chafing products and hydration pack. If something causes a problem on a two-hour outing, it will cause the same problem, only worse, in a marathon or a trail race.
Testing kit in conditions close to race day also means testing the logistics: knowing where to stow gels, how to reach the bladder, how to handle aid stations. These details seem trivial, but they make the difference on the day.
Secret 5: progress without getting injured
Increase the duration gradually
The rule of progression is simple in theory and hard to respect in practice: you do not increase the length of your long runs too sharply from one week to the next. A gradual increase, with load weeks alternating with lighter ones, lets the body adapt without ending up overloaded.
Adapting the long run to marathon preparation
In marathon preparation, a long run generally lasts between 1 h 15 and 2 h 30 depending on the phase of training and the runner’s level. The last big outing before the race should be scheduled at least a week beforehand, and kept short enough that you do not arrive at the start line tired.
Secret 6: prepare your recovery from the moment you stop
What happens in the minutes after a long run matters as much as the run itself. Changing quickly so you are not sitting in damp kit, keeping warm, eating within the post-effort window: these simple actions have a direct effect on the quality of your recovery. Gentle stretching, rest and possibly a foam roller to reduce muscular stiffness complete the picture.
Recovery is not a bonus reserved for professionals. It is an integral part of progress, and neglecting it after a demanding workout wastes part of the work you just did.
Secret 7: work on the mental side
Staying on your feet for 2 h 30 is as much a question of the head as of the legs. The long run is a privileged space for working on concentration, on handling the hard moments, on the ability to stay steady when your body is asking to slow down. Some runners use these workouts to rehearse their race strategies, to visualise the key moments of a course, or simply to learn to stay calm under effort.
This dimension is often underrated in classic training plans. Coaches who work on overall performance build it in as a matter of course, because it is often where the last kilometres of a race are won or lost.
Do and don’t
| Do | Don’t |
|---|---|
| Run mostly in easy endurance (65 to 75% of maximum heart rate) | Set off too fast and turn the workout into a high-intensity effort |
| Test nutrition, hydration and kit in real conditions | Increase the duration too sharply with no recovery week |
| Build in targeted pace blocks according to your race objective | Neglect hydration, or test a new nutrition product on race day |
| Progress gradually from one week to the next | Follow it with a hard workout the next day without enough recovery |
| Recover actively within the hour after the workout | Sit around in damp kit after the effort |
FAQ
How long should a long run be for my level?
There is no universal duration. For a beginner, a long run can start at 1 h 15. For a runner preparing a marathon it can reach 2 h to 2 h 30 depending on the phase of preparation. What counts is that it is longer than the other workouts of the week and that it stays doable at low intensity.
How often should I do a long run?
During specific preparation, one long run a week is a common frequency. Depending on your objectives and your overall training load, some coaches prefer one every ten to fourteen days to leave more room for recovery. The essential thing is not to accumulate too much fatigue and to let the body adapt between each one.
Should I eat during a long run?
Once the duration goes beyond 1 h to 1 h 30, taking carbohydrate during the effort becomes useful for keeping your energy up and delaying fatigue. The long run is precisely the chance to test what you plan to use in a race: gels, bars, dried fruit, drinks. Every strategy should be validated in training before it is used in competition.
The long run, far more than an endurance workout
The long run is about far more than volume. It is a complete workout, touching on physiology, nutrition, kit, mental management and training planning. Built well, it is the foundation of any lasting progress in endurance sport.
If you want to give your long runs structure with precise data, Slek helps you build training that fits your real objectives.
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