What If It Isn’t Just the Sport?
Interoception in athletes — and why common doesn’t always mean normal
It’s so easy to blame how you’re feeling on the sport you do.
Your knees hurt?
“I run. That’s just part of it.”
Your legs feel heavy?
“I’ve increased my mileage.”
You’re exhausted after every session?
“I’m training hard.”
You keep getting niggles?
“I need to work on my strength.”
You’re constantly cold?
“I’ve always been like that.”
Your performance has plateaued?
“I need to train harder.”
You keep getting ill?
“It’s just going around.”
You’re taking longer to recover?
“I’m doing more training than ever.”
You’re struggling to finish sessions that used to feel manageable?
“I need to get fitter.”
You’re sleeping badly?
“Training must be affecting my sleep.”
You’re feeling irritable, flat or completely drained?
“I’m just tired.”
You’re constantly thinking about food or feeling incredibly hungry?
“I do a lot of exercise.”
You’re getting recurring muscle injuries?
“I need to work on my mobility.”
You’re getting stress fractures or bone injuries?
“Running is hard on the body.”
You’re feeling weaker or losing pace and power?
“I’ve lost fitness.”
You’re needing longer and longer to recover?
“I’m just doing more than I used to.”
And sometimes, those explanations are completely valid.
Your shoes might need changing.
Your saddle might be too high.
Your cleat position might need adjusting.
Your training load might be too much.
Your strength programme might need work.
Your technique might need changing.
But there’s another question we don’t always ask:
Are you actually fuelling the work you’re asking your body to do?
Underfuelling doesn’t always look like obvious hunger.
It can show up as persistent fatigue, heavy legs, poor recovery, recurring niggles, repeated injuries, declining performance, feeling cold, changes in mood, getting ill more often, struggling through sessions or simply feeling like your body isn't keeping up.
And this is where it gets complicated.
Because athletes are very good at normalising these things.
We tell ourselves:
“That’s just running.”
“That’s just cycling.”
“That’s just triathlon.”
“That’s what happens when you train this much.”
“That’s what a hard training block feels like.”
But what if your body isn't simply struggling because your sport is demanding?
What if it’s also asking for more fuel?
That doesn't mean every injury, niggle or symptom is caused by underfuelling.
It means fuel deserves to be part of the conversation.
The Things We Normalise
| What you’re experiencing | What you might tell yourself |
|---|---|
| Constant tiredness | “That’s just endurance training.” |
| Heavy legs | “I’ve been doing a lot of mileage.” |
| Poor recovery | “I’m training hard.” |
| Recurring niggles | “Running is hard on the body.” |
| Stress fractures or bone injuries | “It’s the impact from running.” |
| Frequent muscle injuries | “I need to work on my strength.” |
| Feeling cold all the time | “I’m just someone who feels the cold.” |
| Poor concentration | “I’m tired from training.” |
| Irritability or low mood | “I’m stressed.” |
| Getting ill frequently | “Everyone gets bugs.” |
| Poor sleep | “Training is affecting my sleep.” |
| Reduced performance | “I need to train harder.” |
| Losing pace or power | “I’m having a bad training block.” |
| Feeling exhausted after sessions | “That’s what hard training feels like.” |
| Struggling to complete sessions | “I need to get fitter.” |
| Dizziness or light-headedness | “It happens when I train hard.” |
| Persistent hunger or food thoughts | “I’m just hungry because I exercise a lot.” |
| Changes to menstrual cycle | “It’s probably the amount of training.” |
| Reduced libido | “I’m just tired.” |
| Plateauing despite more training | “I need more volume.” |
| Feeling unusually weak | “I’ve lost fitness.” |
| Needing longer and longer to recover | “I’m just doing more than I used to.” |
This table isn't a diagnostic checklist.
None of these symptoms automatically mean an athlete is underfuelled, and many can have multiple causes.
The point is to notice how quickly we can explain away what our bodies are telling us.
And that brings us to something we don't talk about enough in sport:
Interoception: Are You Listening to Your Body?
Interoception is our ability to sense and interpret signals from inside our bodies.
Hunger.
Thirst.
Tiredness.
Temperature.
Heart rate.
Breathing.
The need to rest.
These internal signals are constantly giving us information.
But athletes can become very good at overriding them.
You train when you're tired.
You push through when you're hungry.
You ignore the heavy legs.
You tell yourself you'll eat later.
You postpone recovery.
You keep going.
And eventually, something that might once have been a signal can start to feel like just another part of being an athlete.
That’s where the phrase “listen to your body” becomes more complicated than it sounds.
What if you've spent years being praised for pushing through?
What if you've learned to ignore hunger because eating before training makes you uncomfortable?
What if you don't recognise tiredness until you're completely exhausted?
What if you've become so accustomed to feeling cold, hungry or depleted that you no longer question it?
Sometimes, listening to your body means relearning what those signals actually feel like — and learning to respond to them rather than automatically override them.
“I’m Not Hungry, So I Don’t Need Fuel.”
This is one of the biggest misconceptions around fuelling.
Hunger isn't the only measure of whether your body needs energy.
Training can affect appetite.
Stress can affect appetite.
The timing and intensity of exercise matter.
And if you've spent a long time overriding hunger cues, those signals may not always feel particularly clear.
So fuelling isn't simply about waiting until you feel hungry.
Sometimes, you need to understand the demands of the session and fuel proactively.
You don't need to wait until your body is shouting at you to start listening.
“I Can Get Through It.”
You might be able to complete a session without fuelling.
But getting through a session isn't necessarily the same as fuelling it well.
The question isn't simply:
“Can I survive this workout?”
It's:
“Can I give my body enough fuel to support the work I'm asking it to do — and recover from it afterwards?”
Because carbohydrate isn't something you need to earn because you've trained.
It is one of the key fuels that helps you do the training in the first place.
We’re Very Good at Fixing Everything Except Fuel
When something isn't right, we often start troubleshooting.
Change the shoes.
Move the cleats.
Adjust the saddle.
Change the training plan.
Add strength work.
Get a massage.
Buy another piece of kit.
Train harder.
And sometimes, those are exactly the things that need changing.
But if you're consistently asking your body to do more without giving it enough energy and carbohydrate to support that work, those changes might not address the whole picture.
You can't out-train a lack of fuel.
Your body needs energy for training.
But it also needs energy for everything else.
Recovery.
Adaptation.
Normal physiological function.
Daily life.
And when the demands keep increasing while fuel doesn't, your body has to deal with that mismatch somehow.
Common Doesn't Mean Normal
This is perhaps the biggest thing I want athletes to take away.
Just because something is common in sport doesn't mean we should automatically accept it.
If everyone around you is exhausted, does that make exhaustion normal?
If everyone is getting injured, does that make recurring injuries normal?
If everyone is training through hunger, does that make ignoring hunger normal?
If everyone is struggling to recover, does that mean poor recovery is simply part of being an athlete?
Not necessarily.
There are many reasons an athlete might experience these things.
But common and healthy aren't the same thing.
And the answer isn't always to train less.
It isn't always to eat more.
It isn't always to change your equipment.
It isn't always to push harder.
It's about stepping back and asking better questions.
What is happening?
What is my body trying to tell me?
Am I giving it enough recovery?
Am I giving it enough energy and carbohydrate to support the work I'm asking it to do?
Before You Blame the Sport
The next time you find yourself saying:
“That’s just running.”
“That’s just cycling.”
“That’s just triathlon.”
“That’s what happens when you train this much.”
Pause.
It might be.
But it might also be something worth investigating.
Your body isn't trying to sabotage your training.
The signals aren't an inconvenience to overcome.
They are information.
And learning to notice that information is part of becoming a better athlete.
Because performance isn't just about how much you can push.
It's also about how well you can listen, fuel and recover.
Your body doesn't just need to be trained.
It needs to be listened to.
And fuelled.
Fuel the Work
If you're struggling with fuelling because it doesn't feel enjoyable, it doesn't have to be another part of training you have to force yourself through.
RED-Scue is carbohydrate-first fuel designed to help you fuel the work simply, practically and enjoyably.
Whether you're heading into a long training session, building towards a race or simply trying to get better at fuelling consistently, our packs give you an easy way to make carbohydrate part of your training routine.
Performance starts with fuelling.
Fuel the work.
