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Is it repetitive clicking, or a one time crack like a joint crack?
If it is like a joint crack and does not repeat with every rep, then you are fine.
If your have repetitive popping or noise, then this can often be caused by weakness or instability in the joint. Oftentimes this noise comes from tendons or ligaments not gliding smoothly over other tissue or bones. Sometimes it can come from a tear in the medial meniscus in the knees, or other cartilage in other joints.
Stretch beforehand, and make sure your form and technique are sound. For instance, if your knee is collpasing inward in relation to the toe during squats, lunges, or leg presses, then the knee is not working as a hinge joint, like it should. This misalignment can lead to noise, inflammation, and then pain. You can often use joint noise as a tool to diagnose proper form.
In my case a couple of weeks ago, my knees were slightly swollen with no pain. Every rep of squats clicked, so I moved to leg presses. More clicking. Did leg curls no problem, tried leg extension with noise. My body was telling me not to push it because I could not correct the problem that day. Next leg workout went fine.
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