Our expert says:
I suspect that what is causing your knee problems is an excessive load on the knees. Running obviously places a demand on the knees and then so do squats and lunges. Now, normally, if you train appropriately, the knee gets stronger and can handle this loading, but if the load is excessive, then the little niggles and injuries start to develop. So, it is often a case of just backing off slightly. This may mean doing 2 sets of lunges and squats, not 3. It may mean running for 5 minutes less every couple of days will do it too.
The other factor is technique, and I see that you've been given some advice on those lunges, which is also very important - you have to be really careful not to let that knee get too far forward or ahead of your toe. However, even with perfect technique, you should be aware of possibly over loading the knees.
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