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How to Get Back Into Training After Time Off

Cameron Usher · Founder, PX

19 August 2026 · 6 min read

12 years in competitive sport; trained alongside the Australian Olympic squad; coached 100+ people one-on-one.

Every comeback starts with the same lie: I'll just pick up where I left off.

Three weeks became three months, the way it does. Work, a house move, a baby, an illness, or nothing dramatic at all, just life quietly rearranging your priorities. Now you are back, motivated, maybe a little ashamed, and the most natural thing in the world is to open your old plan and run Monday's session as written. For the version of you who existed three months ago.

Getting back into training after a break fails, when it fails, almost always in the same place: week one, at the intensity you remembered rather than the intensity you have. This post covers what you actually lost and what you kept, where to restart, and how fast to rebuild, so the comeback survives its own first fortnight.

What you actually lost, and what you kept

The good news first, because it is genuinely good: you kept more than it feels like, and what you lost comes back faster than it took to build.

Aerobic fitness goes first and fastest. The engine is expensive to run and your body economises quickly. Within a couple of weeks of stopping, blood volume drops and the aerobic system starts stepping down; after a month or more the decline is real and you will feel it as breathlessness at paces that used to be conversational. This is the loss that makes comebacks feel humiliating, and it is also the most recoverable. Detraining research consistently shows the aerobic decline beginning within one to two weeks of stopping, which is worth knowing in both directions: a one-week holiday costs you close to nothing, and a three-month gap is not a character flaw, it is physiology doing what it does.

Strength holds on much longer. Muscle and the neural patterns that drive it are stubborn. After months away you will have lost some size and some top-end, but the movement quality, the coordination, the years of pattern you built are substantially intact. Which hides a trap.

Your tissues deconditioned faster than your memory did. Tendons, ligaments and connective tissue lose tolerance quietly, and they do not announce it. Your nervous system still knows how to squat heavy and your lungs may cope with the session. The structures that absorb the load are the last to come back, and this mismatch, capability returning faster than durability, is precisely why week one is where comebacks break. The engine says yes, the chassis says nothing at all, until it says stop.

And you kept the thing that matters most. Retraining is reliably faster than training was the first time. The body rebuilds along roads it has already been down. Every previous fit version of you shortens the way back.

Where to restart: the 60 to 80 rule

Here is the number most people want and almost nobody uses: restart at 60 to 80 percent of the volume you left at, with the intensity ceiling pulled down further still.

Two weeks off, no illness? Start near 80, and you will likely be back to normal within a week or two. A month off? Start near 70. Three months or more, or a break that involved illness or injury? Start at 60 or below, and if injury was involved, this becomes a different article, covered properly in returning to training after injury, where the rules are stricter for good reasons.

Notice what the rule is protecting. Not your lungs, which will complain loudly and recover quickly. Your tissues, which will not complain at all this week and will absolutely invoice you in week three. Restarting at 70 percent feels almost insultingly easy for the first few sessions. That feeling is not a sign the number is wrong. It is what the correct number feels like from inside a comeback, because your sense of "normal" is calibrated to a body you do not currently have.

The same honesty applies to the sessions themselves. Familiar movements only, nothing maximal, nothing new. The comeback fortnight is the single worst time in your training life to try the exercise you saw online, for the same reason it is the worst time to PB anything: novelty spends exactly the tissue tolerance you have not rebuilt yet.

The first four weeks

Week one: prove the habit, not the fitness. Two or three short sessions, all comfortably inside the 60 to 80 envelope, all finishing with something left. The only metric that matters this week is that all of them happened and nothing hurts the next morning. If time is part of what broke the habit in the first place, build the restart around a training plan built for busy professionals rather than around the schedule of someone with more hours than you.

Weeks two and three: add volume, hold intensity down. Grow the sessions before you sharpen them: more minutes, an extra set, one more easy run, while the ceiling stays put. The rough guide that has survived decades of coaching practice is adding about ten percent a week, and while sports science argues about the exact arithmetic of safe progression, the consensus is solid on the underlying principle: injuries cluster where load spikes, so the rate of increase is the thing to police. Ten percent is not a law of nature. It is a speed limit for a road you have not driven in months.

Week four: reintroduce intensity, once. One genuinely hard session back on the calendar, and see what it tells you. Recover from it well and the rebuild is on schedule. Feel it for three days and the message is equally clear. Either way, from here you are training again, not coming back, and the plan can start behaving normally.

Throughout, one rule outranks the schedule: soreness that changes how you move is a stop sign, not a data point. General morning stiffness is the comeback working. A specific, sharp, or asymmetric complaint is the chassis telling you the load got ahead of the rebuild, and the response is to step back a week, not push through the message.

The part nobody manages: the plan has to know you left

Everything above is standard good practice, and almost nobody does it, for one structural reason: the plan you left is still sitting there, sized for the person who left it. Static plans have no concept of absence. They resume, they do not rebuild, and the gap between those two words is where most comebacks die.

This is exactly the problem data-driven fitness frameworks exist to solve, because the fix is arithmetic, not motivation. A system tracking your actual completed sessions knows precisely how long you were gone and what the last fortnight really contained. Handled properly, your capacity behaves like a dial rather than a badge: it stepped down while you were away, honestly, and it earns its way back up as the completed sessions accumulate, week over week. The plan that greets you on day one of the comeback is already the 70 percent version, already familiar movements, already intensity-capped, with the reason stated plainly: three weeks away means the first fortnight rebuilds tolerance before it rebuilds fitness.

And each morning of the rebuild, the day still gets sized by the signals, using the same method as how to decide whether to train today, because comeback bodies have more volatile mornings than trained ones. A plan that shrank when your life shrank, and grows only as fast as the evidence supports, is not the compromise option. It is the honest one, and the honest one is the only one that lasts.

PX rebuilds the plan from where you actually are. It knows how long you were gone, restarts your capacity honestly, and grows it from what you really complete, one plan across training, mind and food, with the reason on every adjustment. Start your free trial and let the comeback be planned properly.