Returning to training after injury: how to rebuild load

How to rebuild training load after an injury: the 3-out-of-10 pain rule, your starting dose, week-by-week progression and the signs that need a doctor.

The swelling has gone down, you're walking normally again, and the question is always the same: can I go back to the gym, and with how much weight? The usual pattern is that people come back at about eighty per cent of what they were doing, feel it two days later, take ten days off, then come back too heavy again. Three months disappear with no recovery and no progress.

Coming back isn't the day the pain stops. It's a few weeks in which you deliberately raise the dose and watch how the tissue answers. Here's the order to do it in: how to find your starting point, how much to add each week, which pain is acceptable, and when a check-up beats guesswork.

Work out what you're dealing with

A pulled muscle and an irritated tendon are not the same job. Very roughly: muscle strains usually settle within one to three weeks, tendons and ligaments want six weeks to several months, and bone runs on a timeline your doctor sets. If you don't know which category you're in, build load more slowly than feels necessary.

The second question is whether anything else came with the pain — numbness, obvious weakness, a knee that gives way, a shoulder that slips off its path. That changes the plan and usually needs assessing before you add anything. The evidence is strongest for one simple thing: controlled loading helps tissue recover, while complete rest beyond a few days generally makes matters worse.

Agree the pain rules before the first session

Without a rule, every set turns into a negotiation with yourself. So set the boundaries first, on a 0 to 10 scale:

During the set: up to 3 out of 10 is acceptable. Above that, drop the weight or change the exercise.
An hour afterwards: the pain is back to where it was before you started.
The next morning: no worse than the morning before. This is the check that actually matters.
No new swelling, no limping, no waking up in the night because of it.

If the morning is worse, the last session was too much. That isn't a failure, it's data. Go back to what you were doing seven days ago and stay there for a fortnight before trying again.

Find your starting dose, then take it down a notch

Your starting point isn't what you lifted before the injury. It's what you can do today for three sets of 10 while staying inside the pain rules. For most people that lands somewhere between 40 and 60 per cent of the old working weight. If an empty bar or your own bodyweight is still too much, cut the range of motion instead: half squats, a bench press with limited depth, a 20 cm lunge rather than a full one.

If even that's too much, start with isometrics — hold the position without moving for 30 to 45 seconds, five times, with a minute's rest. Sore tendons often tolerate a hold when they won't tolerate movement, and it gives you something real to do while you wait for room to do more.

Once you've found the dose, take one set off it. Week one should be boring. The point isn't to prove anything, it's for tomorrow morning to feel exactly like this morning.

Add one thing a week

The classic mistake here is raising the weight, the sets and the number of sessions all at once. When something flares up afterwards, you've no idea which one did it. So change a single variable per week:

Weight: around 5 per cent, which in practice means 2.5–5 kg on lower body lifts and 1–2.5 kg upstairs.
Or one extra set on the main movement.
Or two to three more reps per set.
Or one extra session per week for that body part.

The logic is the same one that governs healthy training — if you want the full picture, read up on how progressive overload works. After an injury the principle doesn't change; only the size of the step and the amount of patience do.

Keep effort around 5 to 7 out of 10, meaning three or four reps left in the tank on every set. Training to failure has no place in the first six weeks.

What the first six weeks can look like

Weeks 1–2. Two sessions for the injured area, 3 sets of 8–12, weight at roughly 50 per cent. Lower the weight over 3 seconds — a slow eccentric gives the tissue more work without more kilos.

Weeks 3–4. Add a third session or a fourth set. Range of motion moves towards full, but only while the mornings stay quiet. This is where most people get ahead of themselves.

Weeks 5–6. The main lift returns through a full range at about 70 per cent of the old load. One heavier day (4–6 reps) and one lighter day (10–15 reps) per week works better than two identical heavy ones.

After that you're back in normal programming. If your structure fell apart during the layoff, it's easier to build a programme from scratch than to pick up a plan written for a body you had before the injury.

Train everything that isn't injured

If the shoulder is the problem, your legs still work. If it's the knee, your upper body carries on as normal. That protects your fitness, your sleep and your mood, and it takes away the pressure to push the injured part faster than it can go.

With a sore shoulder it helps to know that the same sensation can come from several different sources — a short guide to what's behind shoulder pain when lifting will make your exercise choices smarter. The same applies to your back: most episodes of low back pain settle with movement and gradual loading, but a few signs mean getting it looked at.

Alongside that: 7 to 9 hours of sleep and 1.6 to 2.2 grams of protein per kilo of bodyweight a day. Neither heals an injury on its own, but recovery between sessions is slower without them.

When to see a doctor

Get it assessed, rather than waiting to see whether it settles, if you have:

numbness, burning or weakness spreading down an arm or leg — there's more on why fingers and feet go numb;
a joint that gives way, locks, or won't take your weight;
swelling that comes back after every session or doesn't clear in a few days;
pain that wakes you at night or is severe at rest;
an injury from a fall or an impact, especially with a visible deformity or a bruise spreading quickly;
fever, redness and heat over a joint;
pain that hasn't moved in either direction for six weeks despite sensible loading.

This isn't a list to panic about, it's a list to make a decision with. At worst an appointment costs you a morning; at best it saves you months of guessing.

Common mistakes

The test session. After ten days off you go in just to see and end up on your old numbers. A test is always at 50 per cent.

Rest as the whole plan. A few days of relative rest makes sense with a fresh injury. Three weeks on the sofa leaves the tissue weaker than it started.

Taking painkillers so you can train harder. That switches off the only feedback you've got. Use medication on the advice of a doctor or pharmacist, not as a ticket to a heavier session.

Avoiding the movement forever. If squatting hurts, the answer is a lighter half squat, not a year without squatting. An avoided movement stays weak and comes back to find you.

Borrowing someone else's timeline. Somebody with the same diagnosis was back in three weeks. That isn't your schedule.

Common questions

How long until I'm back to my old strength?

For minor muscle injuries, usually four to eight weeks. For tendons, realistically three to six months, sometimes longer. Strength tends to return before the feeling of not quite trusting the movement does.

Can I run if it still aches a bit?

If you can walk for 30 minutes with no flare-up, try alternating 1 minute of running with 2 minutes of walking for 20 minutes total, twice a week. Same rule applies: the next morning is no worse.

What if the pain comes back in week five?

Drop to the load you handled two weeks earlier, stay there for 10 to 14 days, then progress in smaller steps. One bad day isn't back to square one — the thing that costs you weeks is throwing out the whole progression.

Do I need a physiotherapist or can I manage this myself?

A mild injury that improves week on week can be managed with the rules above. If nothing changes for three or four weeks, if you're losing strength, or if you genuinely don't know what happened, a professional assessment saves time.

The short version

Pain rule: up to 3 out of 10 during the set, and no worse the next morning.
Start at 40–60 per cent of your old load, three sets of 8–12, with a 3-second lowering phase.
Change one variable a week: about 5 per cent on the bar, or one set, or a few reps.
Keep effort at 5–7 out of 10, and stay away from failure for the first six weeks.
Train everything that isn't injured, and sleep 7–9 hours.
Numbness, weakness, returning swelling or a joint that gives way mean a doctor, not another week of waiting.