Mavr Sports Nutrition Team
Updated September 28, 2026. 8 min read.
Easy runs are forgiving. You can roll out the door on yesterday’s dinner, jog 40 minutes mostly on fat, and feel fine. Hard workouts are not forgiving, because intensity flips your fuel mix toward carbohydrate fast — a threshold or interval session can pull 70-90% of its energy from glycogen and blood sugar. That higher burn rate means the margin for error shrinks: the same low-fuel start that goes unnoticed on an easy run will surface as dead legs in the third interval of a hard one.
This sets up the central tension of pre-workout eating. Show up under-fueled and the session feels like a fitness problem — you blame your legs, your training, your sleep — when it was really a fueling problem you could have fixed with a banana. Overcorrect by eating too much too close to the start and you flip the failure mode: your legs are ready but your stomach is sloshing and cramping at race pace. The job of a pre-workout meal is to thread that needle — enough carbohydrate on board, early enough to digest, simple enough not to revolt.
The closer the workout is, the simpler the fuel should be. Hard running reduces gut comfort, so your pre-run meal should be familiar, carb-focused, and easy to digest.
3-4 hours
Best choiceNormal meal with rice, oats, bread, potatoes, pasta, or fruit
What to avoidVery high fat or very high fiber meals
2 hours
Best choiceSmaller carb meal plus fluids
What to avoidHuge portions, fried foods, heavy sauces
60 minutes
Best choiceBanana, toast with honey, bagel half, sports drink, or small bar
What to avoidBig protein servings or raw vegetables
15-30 minutes
Best choiceGel, chews, sports drink, or a few bites of banana
What to avoidAnything new or slow to digest
| Time before workout | Best choice | What to avoid |
|---|---|---|
| 3-4 hours | Normal meal with rice, oats, bread, potatoes, pasta, or fruit | Very high fat or very high fiber meals |
| 2 hours | Smaller carb meal plus fluids | Huge portions, fried foods, heavy sauces |
| 60 minutes | Banana, toast with honey, bagel half, sports drink, or small bar | Big protein servings or raw vegetables |
| 15-30 minutes | Gel, chews, sports drink, or a few bites of banana | Anything new or slow to digest |
Use these ranges as a starting point. Go to the low end if your stomach is sensitive or the session is short, and the high end for longer or harder workouts.
2-3 hours
Carb target1-2g per kg of body weight if it replaces a meal
60 minutes
Carb target25-50g
30 minutes
Carb target15-30g
15 minutes
Carb target10-25g, only if you tolerate it
| Time before workout | Carb target |
|---|---|
| 2-3 hours | 1-2g per kg of body weight if it replaces a meal |
| 60 minutes | 25-50g |
| 30 minutes | 15-30g |
| 15 minutes | 10-25g, only if you tolerate it |
Tempo run
Fueling targetCarb meal 2-3 hours before; optional small top-up
Why it mattersYou need steady fuel for sustained discomfort
Threshold intervals
Fueling targetCarbs before; fluids if the warmup is long
Why it mattersRepeated hard reps punish low glycogen
Track intervals
Fueling targetSmall, simple carbs if close to start
Why it mattersToo much food can bounce around at faster paces
Hill repeats
Fueling targetCarbs plus hydration; avoid heavy meals
Why it mattersHigh force and high breathing rate can trigger nausea
Marathon-pace long run
Fueling targetBreakfast plus during-run carbs if over 75-90 minutes
Why it mattersThis is race-fueling practice, not just training
| Workout | Fueling target | Why it matters |
|---|---|---|
| Tempo run | Carb meal 2-3 hours before; optional small top-up | You need steady fuel for sustained discomfort |
| Threshold intervals | Carbs before; fluids if the warmup is long | Repeated hard reps punish low glycogen |
| Track intervals | Small, simple carbs if close to start | Too much food can bounce around at faster paces |
| Hill repeats | Carbs plus hydration; avoid heavy meals | High force and high breathing rate can trigger nausea |
| Marathon-pace long run | Breakfast plus during-run carbs if over 75-90 minutes | This is race-fueling practice, not just training |
Morning sessions are where athletes most often underfuel because there is not much time. If you cannot eat a full breakfast, use a small carb top-up and make the previous night more intentional.
Evening workouts fail when lunch was too light or the afternoon snack was too close, too heavy, or too random. Think of the whole day as pre-workout nutrition.
Caffeine can help hard sessions, but it is not a substitute for carbohydrate. A gel or sports drink before a workout can be useful when the session is early, long, or race-specific.
Count the whole session, including warmup and cooldown. Most tempo and interval workouts are short enough that the carbs you ate before are all you need.
The workout is not finished when the watch stops. If another key session is coming in the next 24-48 hours, recovery nutrition is what lets the training stack instead of turning into fatigue.
First 30-60 minutes
Carbs plus protein if the next meal is not soon
Main meal
Normal portion of carbs, protein, vegetables, and fluids
Hot or sweaty session
Replace fluids and include sodium with food or drink
Late-night workout
Eat something easy to digest rather than skipping recovery
| After the workout | What to do |
|---|---|
| First 30-60 minutes | Carbs plus protein if the next meal is not soon |
| Main meal | Normal portion of carbs, protein, vegetables, and fluids |
| Hot or sweaty session | Replace fluids and include sodium with food or drink |
| Late-night workout | Eat something easy to digest rather than skipping recovery |
The runners who fuel hard workouts well are not constantly making fresh decisions — they have a tiny menu of pre-tested defaults and just pick the one that fits the clock. Decide now what your 3-hours-out meal is, what your 60-minutes-out snack is, and what your 20-minutes-out option is, and rehearse each on ordinary workouts so your gut already trusts them. The right answer genuinely shifts when a session moves from 7am to 7pm, or from easy miles to race pace, but once your defaults are set you are matching a known option to the situation, not inventing one under pressure.
Matching workout type, timing, and duration to the right pre-run and recovery target is the translation Mavr runs from your training calendar. But the defaults above are the part that actually shows up in your legs, and building them is free.
Usually yes. If the workout is demanding, carbohydrate before the session helps you hit the target paces and recover better. The closer you are to the start, the smaller and simpler the snack should be.
No. Coffee may help alertness and perceived effort, but it does not replace carbohydrate. For hard workouts, use coffee alongside a carb source if you tolerate both.
Choose low-fiber, low-fat carbs and keep portions smaller close to the run. Examples include a banana, toast with honey, a gel, chews, or sports drink. Practice the same option several times before using it in a race build.
Usually no. Fasted easy runs can be fine for some athletes, but tempo runs and intervals need carbohydrate. Fueling the session improves quality and lowers the chance that the workout feels harder than intended.
A small, simple carb snack of about 15-30g: a banana, gel, chews, sports drink, or toast with honey if you tolerate it. Keep it low in fat and fiber.
Often because lunch and afternoon intake were too low. Evening workouts need an all-day fueling setup, not only a snack right before the run.
Yes. Mavr is designed around workout context, so nutrition targets can change for easy runs, hard sessions, long runs, bricks, rest days, and recovery days.
General guidance for healthy adults, not medical advice. Talk to a doctor or registered dietitian if you have a health condition, take medicines or have special dietary needs. Caffeine advice is for healthy adults only. EFSA's safe limit is 200 mg in one dose and 400 mg in a day.
Stop treating every run the same. Mavr reads your workout type and gives you pre-run and recovery targets that match the session.
Ask Kai, the coach in the app