Why the first two weeks are the risky ones
You used to run three times a week without thinking about it. Then life got in the way, an injury, a new job, a winter you couldn't face the cold for, and six months became a year. Now you want to get back to it, and the temptation is to pick up roughly where you left off, because that's what your head remembers even if your legs don't.
This is where most comeback injuries happen. Not on a big race day, not on a hill, but on an ordinary Tuesday run in week two, when someone tries to do their old long-run distance at their old pace and their calf, knee or lower back objects. The tissue that used to cope with that load has had months off. It's had time to lose some of its tolerance for repeated impact, even if it looks and feels fine standing still.
Your fitness came back faster than your tendons did
Cardiovascular fitness returns reasonably quickly once you start training again. Your lungs and heart adapt within a few weeks. Tendons and the connective tissue around your joints are slower, and they don't announce themselves the way breathlessness does. You can feel capable of running five miles at a decent pace long before your Achilles or your knee is actually ready to handle that volume repeated three times a week.
That gap between how fit you feel and how conditioned your joints and tendons actually are is where the injuries live. It's not always about the total distance you cover. Someone running short, frequent, easy runs after a long break generally does better than someone who runs one big session because it felt good and then can't walk down stairs properly for three days afterwards.
Building back up without overdoing it
There's no single formula that works for everyone, because it depends on how long you were away, what caused the gap, and what your running looked like before it. But a few things hold true for most people coming back after a long layoff.
Start with less than feels necessary. If your instinct says twenty minutes, try fifteen. Run on alternate days rather than back to back, so there's recovery time between sessions while your body adjusts. Increase distance or pace gradually, not both in the same week, and resist the urge to chase your old times in the first month. Old personal bests are not a useful benchmark for week one back.
Pay attention to how you feel the day after a run, not just during it. Mild tiredness in the legs is normal. Sharp pain, swelling, or a joint that feels different to how it did before you started are signs to ease off rather than push through.
The parts people forget to prepare
Running is repetitive by nature, thousands of the same movement through the same joints, over and over. If your hips, ankles or lower back were already a bit stiff before you stopped running, that stiffness doesn't go away during time off. It's often still there when you start again, quietly limiting how your foot lands and how your knee tracks with each stride.
Old footwear is another common trap. Shoes lose their cushioning and support well before they look worn out, and running in trainers that were fine two years ago but have sat in a cupboard since isn't the same as running in fresh ones. Surface matters too. Moving from a treadmill to pavement, or pavement to trail, changes the load through your joints even if the distance and pace stay identical.
When it's worth getting checked
A bit of stiffness after your first few runs back is ordinary and usually settles with rest. Pain that doesn't ease after a couple of days, pain that changes how you walk, or the same niggle appearing in the same spot run after run are different matters and worth having looked at before you build any more mileage on top of them.
An osteopath can assess how your joints, muscles and movement are working together and treat musculoskeletal problems that come from returning to running, alongside advice on how to structure your build-up around them. If something feels seriously wrong, sudden severe pain, a joint that won't bear weight, or swelling that comes on quickly, that needs a doctor's attention rather than waiting it out.
All the osteopaths at Notts Osteopathy are registered with the General Osteopathic Council. We're at 437 Westdale Lane, Mapperley, Nottingham, NG3 6DH, open Monday to Thursday 7.00am to 7.00pm and Friday 7.00am to 6.00pm, closed at weekends. You can reach us on 0747 124 8330.
What to do next
Come back to running slower than feels necessary, spread sessions out, and watch how your body responds the day after rather than just during the run. If a niggle keeps returning to the same spot, get it looked at before you add more distance.
