No Pain, No Gain: Why Effort Matters but Pain Does Not
Half of the old slogan is right. You do need effort to change your body: muscles and the heart adapt when they are asked to do a bit more than they are used to. But pain is not the price of that adaptation, and it is not a sign it is working. Burning muscles, heavy breathing and a set that is hard to finish are effort. Sharp, catching, joint-centred or worsening pain is a signal to stop and change something. The skill worth learning is telling the two apart, because people who train for years without breaking down are the ones who push hard on effort and back off quickly on pain.
Where the slogan came from, and why it stuck
“No pain, no gain” was popularised by the aerobics and bodybuilding culture of the 1980s, though the idea that reward needs suffering is much older. It survives because it is half true and easy to remember. Training that never feels difficult rarely produces much. The trouble is that the phrase collapses two very different sensations into one word, and the people most likely to take it literally are the conscientious ones: the professional who treats a workout like a deadline and would rather grind through a twinge than look soft.
What productive effort actually feels like
Effort has a recognisable profile. It builds gradually across a set, it is spread through the working muscle rather than pinned to one spot, and it fades within a minute or two of stopping. Typical signs:
- A burning or heavy feeling in the muscle as a set goes on.
- Breathing that is hard enough to make talking difficult during cardio intervals.
- The last two or three reps of a set slowing down noticeably.
- A general, even tiredness after the session that is gone by the next day or so.
None of that needs to hurt in the injury sense. It is uncomfortable, and comfort is not the goal, but it is not damage.
What warning pain feels like
Warning pain tends to be sharp, sudden or localised, and it often sits in or around a joint rather than in the belly of a muscle. Treat these as reasons to stop the exercise, not to finish the set:
- A sharp or stabbing pain, especially one that arrives on a particular part of the movement.
- Pain in a joint (knee, shoulder, elbow, lower back) rather than in the muscle working.
- Pain that gets worse rep by rep, or changes how you move.
- Pins and needles, numbness or pain travelling down an arm or leg.
- Swelling, a pop, or a joint that locks or gives way.
- Pain that is still there, or worse, the following morning.
Chest pain, unusual breathlessness, dizziness or palpitations during exercise are a different category altogether: stop and seek medical advice. The NHS guidance on sprains and strains is a sensible reference for the more common musculoskeletal niggles.
Is muscle soreness a sign of a good session?
Not reliably. The stiffness you feel a day or two after an unfamiliar session, usually called delayed onset muscle soreness, is normal and generally harmless. It is most pronounced when you do something new, add a lot of volume, or emphasise the lowering phase of a movement. It typically eases within a few days.
But soreness tracks novelty more than it tracks results. Someone repeating a well-planned programme will often feel very little soreness while still getting stronger week after week. Chasing soreness tends to push people towards random, punishing sessions that are hard to recover from and hard to progress. We cover this in more depth in our piece on muscle soreness after a workout.
How hard should a set be?
A useful way to calibrate effort without pain is reps in reserve: at the end of a set, how many more clean reps could you have done? Most productive strength work for busy adults sits between one and three reps in reserve. That is hard, but you are still in control of the movement, your form has not fallen apart, and you could repeat the session next week with a little more weight.
| Reps in reserve | How it feels | When to use it |
|---|---|---|
| 4 or more | Comfortable, technique practice | Warm-ups, learning a lift, returning after a break |
| 2 to 3 | Hard, last reps slow down | The bulk of working sets for most people |
| 0 to 1 | Very hard, close to failure | Occasional, on safer exercises such as machines or cables |
If the scale is new to you, our guide to reps in reserve and RPE walks through how to estimate it honestly. Most beginners underestimate how many reps they had left, which is another reason not to judge a session by how much it hurt.
A simple traffic-light check
When something feels off mid-session, run through this before deciding what to do:
- Where is it? Spread through the working muscle is usually effort. Pinned to a joint or one small spot deserves caution.
- What kind is it? Burning or heavy is usually effort. Sharp, catching, electric or stabbing is not.
- Does it settle? If it is gone within a couple of minutes of rest, carry on with care. If it lingers, stop that exercise.
- Does it change your movement? If you find yourself shifting to one side or shortening the range to avoid it, stop.
- How is it tomorrow? Mild general stiffness is fine. Pain that is sharper, swollen or limiting deserves a professional opinion.
Green means carry on. Amber means swap to a variation that does not provoke it, reduce the load or range, and note it. Red means stop that exercise for the day and get it looked at if it persists.
Why training through pain backfires
Pushing through warning pain tends to cost more time than it saves. A small irritation that would have settled with a week of adjusted training can become a problem that keeps you out for a month. Pain also changes how you move: you shift load away from the sore area, often onto tissues that were not prepared for it. And there is a quieter cost. People who associate training with genuine pain tend to stop, and consistency over years matters far more than any single heroic session.
The UK Chief Medical Officers’ physical activity guidelines ask adults for regular moderate or vigorous activity and muscle-strengthening work on at least two days a week. Nothing in them requires you to suffer. They require you to keep turning up.
What a coach does differently
In a coached session, effort is managed on purpose. A good coach watches the last reps of each set, adjusts load when bar speed or form changes, and has a substitute ready when a movement does not agree with you that day: a split squat instead of a back squat, a neutral-grip press instead of a barbell bench. The aim is a session that is hard in the right places and quiet in the joints. That is how training is run in private 1-1 sessions at the Highgate studio, where the room is yours alone and every set is watched.
If you are carrying something already, training around an injury explains how to stay active while it settles rather than stopping altogether.
Common mistakes
- Judging a session by how wrecked you feel. Track the weights, reps and how the movement looked instead.
- Taking every set to failure. It piles up fatigue without adding much, and form usually breaks first.
- Skipping the warm-up because you are short of time. Five minutes of lighter sets is what lets the heavy ones feel like effort rather than strain.
- Ignoring the same twinge three sessions running. A pattern is information. Change the exercise before it changes your plans.
Check with your GP first if you are returning after a long break, are pregnant, have a heart condition, or have an injury that has not been assessed.
Questions we get asked
Is it okay to train while still sore?
Usually, yes. Light to moderate training often eases general stiffness. If soreness is severe or limits your movement, train a different area or keep the session gentle.
Should a workout hurt the next day?
It does not need to. Some stiffness after a new or bigger session is normal, but steady progress is the better measure of a good programme.
How do I know if I am pushing hard enough without pain?
Use reps in reserve. If you finish most working sets with two or three good reps left and add a little weight or a rep over time, you are working hard enough.
When should I see someone about pain?
If pain is sharp, sits in a joint, comes with swelling or numbness, or is no better after a few days of adjusted training, speak to your GP or a physiotherapist.
For more on how sessions are run, see personal training with Artem in Highgate, or start at The Highgate House homepage.
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