How to Recover from Bonking Mid-Race with Food and Fluids

Bonking mid-race isn’t a cue to push harder. Knowing how to recover from bonking mid-race starts with easing off or stopping, letting your heart rate settle, then taking glucose and fluids. Continue only when you feel recovered. Shakiness, dizziness, nausea, confusion or poor coordination means stop and seek medical help.

A sudden energy crash can feel like a fitness problem, but depleted glycogen may be part of it. You’re right to focus on fuel and hydration: both matter during a race and afterwards. During running, carbohydrate intake can range from 50 to 250 calories of glucose per hour.

This guide explains how glycogen depletion can contribute to bonking, what to do when your energy drops, and how fluids and electrolytes fit into recovery. You’ll also learn how post-run nutrition can support recovery and help reduce lingering lethargy.

2. Electrolyte replacement

Electrolytes belong in your recovery plan, but they don’t replace carbohydrates when glycogen depletion causes a mid-race crash. Water and electrolyte-containing drinks can both contribute to post-race rehydration. The right balance depends on how much fluid and salt you’ve lost through sweat, which varies with conditions and effort.

After a long run, rehydrate steadily and monitor your urine. A practical target is for it to return to a light lemonade colour within two hours. Amber or apple-juice-coloured urine after a long run can signal dehydration. Colour is a useful check, but don’t ignore how you feel or any other symptoms.

Follow a simple sequence after finishing: start drinking, include an electrolyte-containing drink, and continue rehydrating until your urine reaches a light lemonade colour. Water can be part of the routine, while electrolyte drinks offer another option. Neither is an instant fix for fatigue caused by low fuel. After bonking, you may need carbohydrates as well as fluids.

• During training: carry fluids and a rescue gel on bonk-point runs, so both are available if energy drops.
• After a long run: use urine colour as a practical hydration cue, aiming for light lemonade within two hours.
• After a race: include water and electrolyte-containing liquids in your rehydration routine.

Electrolytes are useful for addressing fluid and sweat losses, but they don’t replace a recovery meal. Rehydrate alongside carbohydrate and food after exercise rather than relying on a sports drink alone. If you experience shakiness, dizziness, nausea, confusion or poor coordination during a race, stop exercising and seek medical help. These symptoms need more than an electrolyte top-up.

3. Glycogen depletion as a cause of bonking

Glycogen is carbohydrate stored in your muscles and liver, ready to support hard efforts. As a workout continues, your muscles draw on that fuel. Running without carbohydrate intake can lead to bonking after 1.5 to 2.5 hours for many runners. The timing varies with effort, available glycogen and the carbohydrates consumed before and during exercise.

Consider a workout that uses 1,000 calories, with roughly 800 calories coming from carbohydrate. That example shows why carbohydrate availability matters during sustained running. If your supply can’t keep pace with the demands of the effort, your legs may feel heavy and your pace can falter. Bonking isn’t simply a lack of determination; depleted fuel can limit your ability to maintain intensity.

Should you slow down, walk or stop when bonking mid-race? Stop running and pause exercise, allowing your heart rate to settle. Wait until you feel recovered before continuing, rather than forcing the pace while your energy is low.

Fuel planning starts before race day. The International Society of Sports Nutrition recommends 8 to 12 g of carbohydrate per kilogram of body weight per day to maximise glycogen stores. That daily range is a preparation target, not a dose to consume all at once during a race. During training, note when your energy drops and whether your carbohydrate intake has matched the duration and intensity of the workout. Use that pattern to refine race-day fuelling, rather than waiting for a severe dip to act. A carbohydrate-free training run is not a race-day strategy: racing requires a plan that supports sustained effort.

3. What are the immediate steps to recover from bonking during a race?

Act early if your energy drops sharply or your running becomes difficult to control. Knowing how to recover from bonking mid-race starts with putting safety ahead of pace. Stop running, move clear of other competitors if you can, and pause somewhere secure. Don’t try to hold your target pace through the crash.

1. Get stable. Stand or sit somewhere safe, then take a moment to assess how you feel. If you’re on a crowded course, alert a nearby official or runner before moving aside.
2. Let your effort settle. Pause and allow your heart rate to come down. Don’t restart just because you’ve reached a course marker or taken a few steps.
3. Use your practised plan. If you feel able, take the carbohydrate and fluids you planned for the event. Avoid trying unfamiliar fuel or forcing intake while feeling unwell.
4. Make a clear decision. Continue only when you feel recovered enough to move safely. If symptoms persist, worsen, or return after restarting, stop racing and seek help.

Shakiness, dizziness, nausea, confusion or poor coordination are signs to stop exercising and seek medical help. Don’t dismiss confusion or impaired coordination as an ordinary pace slump. Tell someone nearby you feel unwell and need assistance. When deciding how to recover from bonking mid-race, getting help matters more than finishing.

If you resume, keep your effort controlled and monitor how you respond. Don’t surge to make up lost time, and stop again if symptoms return. After the event, note what you experienced, what fuel you took and whether it was easy to access. These details can help you refine your race-day preparation for your next event.

4. How much carbohydrate should you take during a race to recover from a bonk?

Dr Clyde Wilson recommends consuming 50-250 calories of glucose per hour while running. That broad range gives you a starting point, not a one-size-fits-all rescue dose. Your race duration, pace, and ability to tolerate fuel all affect what works in practice. Don’t try to make up a long period without fuel by taking a large amount at once.

If you feel a bonk developing, start with the immediate steps above: pause, let your effort settle and take fuel only if you can do so comfortably. Then return to your planned carbohydrate intake instead of guessing or doubling your next serving. Glucose provides carbohydrate during exercise, but taking fuel while running hard can feel different from taking it at an easier pace. Practise your chosen approach during training, including how you carry and access your fuel.

• Use your practised plan: follow the hourly intake you’ve rehearsed, rather than testing unfamiliar fuel during a race.
• Take manageable portions: spread your planned intake across the race instead of trying to replace missed fuel in one hit.
• Pair fuel with fluids: include fluids in your race plan, especially if swallowing fuel while running feels difficult.

The 50-250-calorie range refers to glucose per hour, not a guaranteed amount to consume after symptoms begin. A gel, chew or drink may provide carbohydrate in a different form, so use the product information to understand its serving and fit it into your own hourly plan. If nausea or other concerning symptoms make fuelling difficult, stop exercising and seek medical help rather than forcing intake.

Build a race-day fuel strategy around consistent carbohydrate intake, not a last-minute rescue. Explore race-day carbohydrate fuel as you plan what to carry and practise using it.

Fastgear Australia

Fastgear Australia helps endurance athletes prepare a practical race-day fuelling setup with sports nutrition and technical racing gear. If you’re refining what to carry after an energy crash, consider how familiar carbohydrate options fit your plan. GU Energy Gel – Single and Clif – BLOKS Energy Chews are available through Fastgear Australia.

Choose fuel you’ve practised with, then plan how you’ll carry it during the event. The Compressport Free Belt Pro is another option for your race kit. These products can support your preparation, but they don’t replace stopping and seeking medical help if you experience concerning symptoms during a race.

Find sports nutrition and gear for your fuelling plan at Fastgear Australia.

Build a race plan you can trust

Make your next training run a practical rehearsal, not just another session. Decide how you’ll respond if your energy drops and make sure your fuel is easy to reach. A repeatable routine can reduce last-minute decisions when fatigue makes it harder to think clearly.

Turn what you’ve learned about how to recover from bonking mid-race into a plan you can practise: choose familiar fuel, organise how you’ll carry it and know when to stop. Adjust your approach to what you can tolerate and what helps you move safely. If you experience symptoms such as confusion or poor coordination, prioritise medical help over finishing.

Use your preparation to build confidence in your decisions, not to promise a perfect race. Fastgear Australia can help you explore endurance nutrition and racing gear for your setup. Contact Fastgear Australia to discuss your race-day needs, then take your plan into training with focus.

Frequently Asked Questions

Can you prevent bonking?

Reduce the chance of bonking with a fuelling plan matched to your event. Practise taking carbohydrates during training, especially on longer sessions, and note what you tolerate while moving. Carry fuel where you can reach it without disrupting your rhythm. If a workout reveals an earlier-than-expected energy drop, review your plan instead of waiting until race day to make changes.

Is it safe to continue working out after bonking?

Don’t continue a hard workout while you still feel unwell or depleted. If you feel recovered after pausing, keep any resumed effort controlled rather than testing yourself with a sprint or steep climb. Stop again if symptoms return. Note the session, what you ate and drank, and when the energy dip occurred to help adjust your next training approach.

What causes bonking?

Bonking commonly occurs when prolonged exercise uses carbohydrate faster than your body can replace it. Muscles draw on stored glycogen to sustain effort, so a long workout without enough carbohydrate can leave less fuel available to maintain pace. The risk depends on exercise duration, intensity and fuelling. A sudden slowdown can reflect this energy shortfall, rather than a lack of effort or motivation.

When is it unsafe to continue racing after a bonk, and when should you seek medical help?

Stop racing and seek medical help if you experience shakiness, dizziness, nausea, confusion or poor coordination. These symptoms make continuing unsafe, particularly if you can’t move or make decisions reliably. Tell a nearby race official or another person that you need help. Don’t restart just to reach the next checkpoint; wait for assistance and put your wellbeing ahead of finishing.

How can runners and cyclists prevent bonking with race-day carbohydrate and hydration plans?

Build your race plan around fuelling you’ve practised in training. Dr Clyde Wilson recommends 50-250 calories of glucose per hour while running; use the range to inform a plan, not as a sudden rescue dose. Runners and cyclists can schedule carbohydrate intake across the event and carry it accessibly. Include water and electrolyte-containing liquids in your hydration approach, adjusting to conditions and personal tolerance.