Training when your knee is playing up

• Pain is a signal to modify, not a reason to quit moving entirely.

• Upper body and core work keeps momentum while your knee settles down.

• If swelling or sharp pain appears, stop and see a GP or physio.

A painful knee does not mean bed rest and biscuits for a fortnight. It means you stop loading the joint in the way that hurts it, and you shift your effort somewhere else. Most people do neither. They either push through and make things worse, or they stop completely and lose the habit entirely. Both are mistakes. The honest answer is that most knee pain — the dull, achy, came-on-gradually kind — responds well to staying active within a pain-free range. Sharp pain, swelling, or pain that followed an impact or twist is different. That needs a GP or physio before you do anything else. If you are not sure which category you are in, get it checked. That is not being cautious, that is being sensible.

Heavy squats, lunges, leg press with a loaded stack, running on hard ground, and anything that has you landing from a jump — all of these put significant force through the knee joint. Cut them out for now, not forever. Box jumps at the council gym on a concrete floor are not worth it when you are already hurting. Hill running and stadium steps fall in the same category. If you do parkrun on a Saturday morning, either skip it or walk the course — walking it still counts, still keeps the routine, and does not set you back. The point is not to protect yourself into doing nothing. The point is to stop repeating the specific movement that is irritating the joint while everything else continues.

Upper body training is almost entirely unaffected by a dodgy knee. Pull-ups, rows, pressing, carries — get on with it. If your knee hurts on a leg day and you are in a garage gym, that is not a rest day, that is an upper body day. Swimming is excellent if you have access to a pool; the water takes load off the joint and you can move freely. Cycling, particularly on a stationary bike with the seat set high enough that your knee is not deeply bent, tends to be well-tolerated. Core work on the floor — planks, dead bugs, bird dogs — has nothing to do with your knee and everything to do with keeping you together. Seated or lying leg work that does not compress the joint, such as straight-leg raises, is often pain-free and keeps the muscles around the knee from switching off entirely, which matters more than most people realise. Weakness in the muscles above and below the knee is part of why it hurts in the first place. Strengthening them, carefully, is part of how it gets better.

Before you train, do ten slow bodyweight squats. No weight, just you. If there is no pain, you have more options. If there is mild discomfort that does not get worse as you move, train with lighter loads and shallower range. If it hurts more with each rep, or if the joint feels unstable, do your upper body session and leave it there. This is not a complicated system. It is just paying attention rather than ignoring the signal and hoping for the best. One practical note: if your knee is stiff first thing but loosens after ten minutes of gentle movement, that is different from pain that gets worse as training goes on. Stiffness that eases is usually fine to train through. Pain that builds is not. Keep it simple. Modify rather than quit. If it is not improving after two or three weeks of sensible training and rest from the aggravating movements, book an appointment. A physio will give you a specific answer that no article can.

Sometimes a bit of stiffness clears once you are warmed up, and that is usually fine. But if your knee hurts during the run or feels worse afterwards, running through it is likely making the underlying problem worse and extending the time it takes to resolve. Swap road running for a bike or swim until it settles, then reintroduce running gradually — shorter, slower, softer ground first. Parkrun on grass is a better reintroduction than a 10k on pavement.

A sleeve or support can help some people feel more confident and may reduce discomfort during activity. It is not fixing the problem, but it is not doing harm either. If you find it helps, use it. Do not rely on it to train through pain that would otherwise tell you to stop — it will mask the signal, not resolve what is causing it. If you are finding you cannot train without it, that is a reason to see a physio, not a reason to buy a better support.

That depends entirely on what is causing the pain, which is something only an examination can determine. Niggles that came on gradually from overuse often settle within a few weeks of modifying load and adding appropriate strengthening work. Problems that followed an injury, or that have been present for months without improvement, take longer and need professional assessment. There is no honest general answer here, and anyone giving you a confident timeline without knowing your situation is guessing.