Can You Exercise With Pain? When to Push and When to Stop
by: Chin Yi Khern, Physiotherapist, Regis Wellness
Last updated: August 25, 2026
What if the pain you've been avoiding during exercise isn't a warning sign at all? What if it's just noise from a nervous system that's learned to be overprotective? And what if your cautious response to it, stopping, resting, avoiding, is the very thing making your body weaker and more pain-sensitive over time?
These aren't hypothetical questions. They describe one of the most common patterns we see at our clinic. Someone feels discomfort during exercise. They assume it means something is wrong. They stop the exercise. Then they stop the next one. Then they stop going to the gym entirely. Months later, they're in more pain than when they started, not because the original issue got worse, but because everything around it got weaker.
But the opposite mistake exists too. The person who ignores every signal, trains through sharp pain, and turns a minor issue into a three month injury. That's just as common and just as preventable.
The real skill isn't ignoring pain or obeying it. It's learning to read what type of pain you're experiencing and what it's actually telling you. And that requires something more useful than "listen to your body."
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Why "Listen to Your Body" Is Terrible Advice
It's the most repeated phrase in fitness. And it's almost completely useless.
Not because the principle is wrong, but because nobody explains what you're supposed to be listening for. Your body doesn't speak in sentences. It sends signals. Dull aches, sharp catches, stiffness, burning, throbbing, tightness. Each of these means something different. Some are telling you to stop. Some are telling you you're doing exactly what you should be. And some are just noise from a system that's learned to be cautious after a previous injury, a stressful week, or a bad night's sleep.
Without a framework for interpreting those signals, "listen to your body" becomes whatever you want it to mean. For the anxious person, it means stop at the first hint of discomfort. For the stubborn person, it means ignore everything until something snaps. Both are listening. Neither is hearing correctly.
Pain researchers Lorimer Moseley and David Butler demonstrated in their work on pain neuroscience that pain is not a direct measurement of tissue damage. It's a protective output of the brain, influenced by tissue state but also shaped by stress, sleep, previous experience, beliefs, and context. This means pain during exercise can mean you're causing harm. It can also mean your nervous system is being overprotective about something that's perfectly safe. Same sensation, completely different implications.
What you need isn't a platitude. You need a decision tool.
The Traffic Light Framework
Physiotherapists use a practical model called the traffic light system to help patients make real-time decisions about pain during exercise. It's simple, and once you understand it, you can apply it to every session, every sport, and every movement.
The model works on two dimensions: what the pain feels like during exercise, and what happens in the 24 hours after.
Green Light: Keep Going
This is the zone most people misidentify as a problem.
Green light pain is mild discomfort, roughly 0 to 3 out of 10. It's an awareness rather than an alarm. You notice it, but it doesn't change how you move. Your form stays the same. Your range of motion isn't restricted. The sensation might be there at the start and fade as you warm up, or it might sit in the background throughout the session without escalating.
Here's what green light pain actually feels like during exercise:
A dull ache in your knee during the first few squats that fades by the third set. A vague tightness in your lower back that loosens as your workout progresses. A mild tenderness in your shoulder during overhead press that doesn't change your movement or make you compensate. General stiffness after a week of sitting that eases once your body warms up.
After the session, green light pain settles back to baseline within a few hours. The next morning, you feel the same as or better than before you exercised.
This is safe to train through. In many cases, it's actually beneficial to train through. Movement increases blood flow, stimulates tissue adaptation, and often reduces the sensation itself. For people recovering from injury or managing chronic pain, staying active within this zone is exactly what the physiotherapy research supports. We covered this principle in depth in our article on why resting a sports injury can backfire and our piece on why inactivity makes everything hurt more.
The danger isn't the green light pain. It's the person who interprets it as a red light and stops moving entirely. A 37 year old consultant stopped going to the gym after his knee started aching during squats. He assumed something was wrong and that continuing would make it worse. Three months later, his knee hurt more than before he stopped. His quads had weakened. His joint had stiffened. The original discomfort had been a minor irritation that would have resolved with a simple form adjustment. The three months of avoidance created the genuine problem. His response to the pain did more damage than the pain ever would have.
Amber Light: Modify and Monitor
This is the zone that requires the most judgment.
Amber light pain is moderate, roughly 4 to 6 out of 10. You definitely notice it. It might make you hesitate before a rep or adjust your grip. It's distracting but not debilitating. You can continue, but you're aware that something isn't entirely comfortable.
Here's what amber light pain feels like during exercise:
An ache in your achilles that's present from the start of your run and doesn't warm up the way it used to. A tightness in your shoulder during overhead movements that limits how high you can reach but doesn't produce a sharp catch. A discomfort in your knee during lunges that makes you favour the other leg slightly. A lower back stiffness during deadlifts that doesn't ease after your warm-up sets the way it normally would.
The amber zone isn't automatically a reason to stop. But it is a reason to modify.
Modification means reducing load, changing range of motion, adjusting tempo, or switching to a variation that keeps you moving without aggravating the issue. Your achilles aches during running? Drop the pace or switch to cycling for today. Your shoulder is uncomfortable overhead? Stay below 90 degrees and work in the pain-free range. Your knee doesn't like deep lunges? Do half-range or swap to a step-up.
The critical test is the 24 hour rule. If your pain after the session returns to baseline by the next morning, the load was acceptable. If you wake up noticeably worse than before you exercised, you overshot. That backward-looking check tells you whether your modification was enough, and it calibrates your decision for the next session.
If you've been in the amber zone for the same issue for more than two weeks without it shifting toward green, that's your signal to get assessed. The pain isn't resolving on its own, and continuing to train through it without understanding the cause risks either progressing to a red light or developing the kind of compensation patterns we described in our article on why waiting for pain to go away costs you more.
Red Light: Stop and Reassess
This is the zone where the decision is clear.
Red light pain is severe, roughly 7 out of 10 or higher. It's sharp, sudden, or escalating. It changes how you move. It makes you flinch, guard, or alter your form to avoid it. You can't perform the exercise the way you normally would because the pain is overriding your movement.
Here's what red light pain feels like during exercise:
A sharp catch in your knee at a specific angle during a squat that makes you rack the bar immediately. A sudden shooting pain down your leg during a deadlift. A stabbing sensation in your shoulder during a serve in tennis or an overhead clear in badminton. A pop in your calf during a sprint followed by immediate pain. Pain that gets worse with every rep rather than staying the same or easing.
Stop the exercise. Don't try to push through it, modify it, or "loosen it up." Red light pain is your body sending an unambiguous signal that the load exceeds what the tissue can handle right now.
After stopping, the question becomes: is this a one-off provocation (a single awkward rep that caught a joint at a bad angle) or a pattern (the same sharp pain every time you do this movement)? If it's a one-off and the pain settles within minutes, you might be able to continue with a different exercise. If it's a pattern, or if the pain persists after the session, or if there's swelling, visible deformity, or inability to bear weight, get assessed.
Not every red light is a serious injury. But every red light deserves respect. Continuing to train through this level of pain is how minor issues become significant ones, how tendon irritations become tendon tears, and how manageable problems become months-long rehabilitation projects.
The Type of Sensation Matters More Than the Number
A pain scale from 0 to 10 is useful but incomplete. Two sensations can both register as a 5 out of 10 and mean completely different things.
A dull 5/10 ache during a run that you've had for three weeks, that doesn't change from kilometre to kilometre and feels the same today as last Tuesday, is very different from a sharp 5/10 catch during a squat that started today and fires only at a specific depth. Same number. Different language entirely.
Dull, broad, diffuse ache is usually muscular. It often reflects fatigue, delayed onset soreness, general tension, or chronic adaptation. It typically responds well to continued movement and rarely indicates structural damage. This is the sensation most often misinterpreted as a problem when it's actually benign.
Sharp, localised, movement-specific pain is more likely to involve a joint, tendon, or ligament. It tends to fire at a specific point in a movement and ease when you change position. This is a structural provocation, and it deserves modification or avoidance of that specific movement pattern.
Burning or shooting pain that follows a line is nerve related. If the pain radiates from your back down your leg, or from your neck into your arm, that's a nerve pathway being irritated. As we covered in our article on how pain travels along nerve pathways, the source is often somewhere different from where the symptom shows up. Stop the aggravating activity and get assessed.
Pain that warms up and fades is generally a good sign. It means the tissue was stiff or sensitised from rest and responds positively to movement and increased blood flow. This is classic green light territory.
Pain that starts low and escalates with continued activity is a warning pattern. The tissue is being loaded beyond its current capacity, and every rep or minute is adding to the strain. Reduce the load or stop. This is the pattern behind most overuse injuries, the same progressive loading error we described in our article on why your weekend workout is the riskiest thing you do.
The Saturday Morning Decision
It's Saturday morning. You've got a court booked. Your shoulder has been a bit sore all week. What do you do?
First, classify the pain. Is it a dull ache (green), a moderate discomfort that limits certain movements (amber), or a sharp pain that fires during specific actions (red)?
If it's green, play. Warm up thoroughly. Pay attention to how it responds. If it eases during warm-up and stays low throughout, you're fine. If it escalates, drop the intensity or modify your game (fewer overheads, more drives and drops).
If it's amber, you can probably play, but modify. Reduce the intensity. Avoid the specific movements that provoke it most. Don't play a third set if the second one aggravated it. And check how you feel the next morning. If it's worse, the load was too much.
If it's red, sit out. One missed session is nothing. An injury that turns a two week issue into a three month one because you played through it is a much bigger disruption. Get it assessed early. As we covered in our article on how to tell if you need physio or rest, the two week rule applies: if it's not clearly improving with self-management, get assessed.
The same logic applies to the gym, to running, to any physical activity. The framework doesn't change. The exercise does.
When Avoiding Pain Becomes the Problem
This is the side of the equation that most fitness content ignores, and for your audience it's often the bigger risk.
The desk-bound professional who exercises on weekends and starts feeling discomfort is more likely to err toward caution than toward recklessness. They stop the exercise that caused discomfort. Then they avoid similar exercises. Then they reduce their training altogether. Their world gets smaller. Their body gets weaker. And the deconditioning that follows creates new pain in areas that were previously fine.
This is the fear avoidance cycle, and it's driven by the belief that all pain means damage. We've covered this pattern across multiple articles: in our piece on joint clicking anxiety, in our exploration of how MRI results create unnecessary fear, and in our article on why rest becomes the problem rather than the solution.
The traffic light framework exists to prevent this. Not every pain is a red light. Most of the discomfort you experience during exercise is green: safe, manageable, and often beneficial to work through. Knowing that, with confidence and a clear framework for when you're wrong, is what keeps you active rather than anxious.
A Simple Framework to Remember
Green (0 to 3/10):
- Mild discomfort.
- Doesn't change your form.
- Often warms up and fades.
- Settles within hours.
- Safe to continue.
Amber (4 to 6/10):
- Moderate pain.
- Noticeable, may limit range.
- Modify the exercise (reduce load, change range, switch variation).
- Check the 24 hour rule: if worse the next morning, you overshot.
- If two weeks of amber without improvement, get assessed.
Red (7+/10):
- Sharp, escalating, or form-altering.
- Stop the exercise.
- If it settles quickly and doesn't recur, you may continue with a different movement.
- If it persists, recurs, or comes with swelling or instability, get assessed.
The sensation check:
- Dull and diffuse is usually muscular and safe.
- Sharp and specific is structural and needs caution.
- Burning or radiating is nerve-related and needs investigation.
- Escalating is always a stop signal regardless of where it started.
The 24 hour rule:
- Your best assessment tool.
- If pain returns to baseline by the next morning, the load was acceptable.
- If it's worse, adjust next time. Track the pattern over sessions, not within a single one.
The Bottom Line
Most pain during exercise is manageable once you understand what it means. Green light discomfort is safe and often necessary for adaptation. Amber light pain is your body asking you to pay attention and adjust. Red light pain is your body telling you to stop. The framework is simple. Applying it to your specific situation sometimes isn't. If you're unsure whether your pain is something to train through or something to get checked, come in and let's figure it out together. Reach out on WhatsApp whenever you're ready.
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