Niggles vs injuries: when to push and when to stop

Somewhere between day eight and day fifteen, something will start complaining. A shoulder that clicks on the second set, a knee that aches on stairs, a low back that's stiff on Wednesdays.

The instinct is one of two extremes: ignore it entirely, or stop training. Both are usually wrong, and the cost of the second is higher than people think, because a program abandoned on day twelve produces nothing at all. What you need is a way of sorting the signal in the ninety seconds between sets.

The traffic light

Green is diffuse muscle soreness. It's spread across a muscle belly rather than pointed at a spot, it's symmetrical or nearly so, it turns up a day after a session you know was hard, and it improves as you warm up. That's normal training soreness and it isn't a reason to change anything.

Amber is a joint or tendon that's grumbling. It's more localised, it might be one-sided, it's noticeable at the start of a set and fades once you're moving, and it doesn't get worse as the session goes on. Amber means modify, not stop.

Red is different in kind, not degree. Sharp pain, pain that increases through the session, swelling, a joint that gives way, numbness or pins and needles, an inability to put weight through a limb, or pain that wakes you at night. Red means stop the movement and get it looked at.

• Sharp, stabbing or electrical pain rather than a dull ache
• Pain that gets worse set by set instead of easing with the warm-up
• Visible swelling, obvious bruising, or a joint that looks different from the other one
• Numbness, tingling, or weakness that isn't fatigue
• A joint giving way, locking, or pain severe enough to wake you at night

What amber actually means

Amber is not a light version of red. It's a load-management problem, and the answer is nearly always to keep training the pattern with less provocation rather than to rest it completely.

Complete rest feels responsible and usually isn't. Tissue adapts to load, and a tendon that gets nothing for two weeks is weaker when you return than it was when you stopped. National health guidance on musculoskeletal pain has moved steadily toward staying active within tolerance for exactly this reason.

The practical version is a threshold. Discomfort you'd rate as mild, that doesn't get worse during the set, and that has settled back to baseline by the next morning, is acceptable. Anything past that means the modification wasn't enough.

Three questions sort almost every amber case in the ninety seconds you have between sets. Is it worse than the last set, or the same? Is it in one specific spot, or spread out? And was it there before you warmed up, or did it arrive with the load? Getting worse, specific and arriving with load is the combination that means change something now.

“Rest is not a treatment. It is a pause during which the tissue gets weaker.”

How to train around an amber joint

Four dials, in order of how much you should reach for them. Load comes first: drop the weight by a quarter and add reps to keep the set honest. Then range: work in the part of the movement that doesn't provoke it, and expand as it settles. Then tempo: slow the lowering phase, which usually reduces the sharp entry into the painful position. Only then substitute the exercise.

Substitution is last on purpose, because the pattern is the training stimulus. The program cares that you did a hinge, a squat, a push and a pull — the specific implement is negotiable. There are dedicated articles in this batch for the two joints this comes up for most, backs and knees, plus one on shoulders.

The plan at /dashboard/plan lists the movement pattern for each day alongside the prescribed exercise, which is what makes this workable. Swap the implement, keep the pattern, and the day still counts as training done — that judgement call is yours to make honestly, and modifying for an amber joint is exactly the case it was written for.

The rules that stop amber becoming red

None of this is diagnosis, and it isn't a substitute for one. This article is a sorting tool for deciding whether to modify a session or seek help — a physiotherapist or doctor is who assesses an injury, and the sooner they see a red flag the smaller the interruption tends to be. If you have an existing injury or condition, get cleared before starting the program rather than after.

• Never test a painful joint by loading it heavier to see if it still hurts. That is not a test, it is the injury
• Change one variable at a time, and give it two sessions before deciding whether it worked
• Track it. A note against the session — which movement, which range, how bad — turns a vague feeling into a pattern you can act on
• If an amber niggle hasn't improved at all in two weeks, it has stopped being a niggle. Book the appointment
• If a red flag appears, stop that movement for the day. Keep the other five daily targets and take the training miss cleanly