You may sometimes notice a crackling, popping or clicking sound in a joint when you move. This is known as crepitus and usually means that air is moving in the joint, which is harmless. This most often occurs in knees, but may may also happen in your shoulders, elbows or neck.
If you are comfortable with clicking and have no pain, then you can continue with the exercise.
If you have pain in the joint along with the sound, it might be a sign of wear and tear such as osteoarthritis or be due to an injury in the cartilage, in which case, you should contact your GP.
Snapping Hip Syndrome
This is the term for a clicking or snapping feeling or sound around your hip when you move your leg. In most cases, it is not painful and there is nothing to worry about.
It is usually due to either your Iliotibial band or your Iliopsoas tendon snapping over a bony prominence on the outside of your pelvis.
Rather than making your hip snap frequently, you can avoid it by reducing your range of movement. Strengthening the muscles around the hip joint may help.
In rare cases, it can be due to a tear in the hip cartilage or bone debris in the hip joint. This will be painful and might cause the hip to lock up, in which case, you should contact your GP.