It is not uncommon for knees to make a creaking sound during exercise, and many people have had similar experiences. This sound is commonly referred to as "joint noise" and may be caused by the following reasons:
Bubble rupture: Bubbles in joint fluid may rupture during movement, producing sound.
Ligament or tendon sliding: Ligaments or tendons around the joint sliding over the bone during movement may cause creaking sounds.
Joint wear: As the amount of exercise increases, joints may experience some wear, especially after high-intensity training.
If you don't feel pain or discomfort, you usually don't need to worry too much. But it is recommended to continue monitoring your physical reactions and ensure proper posture and technique during training. If the sound is accompanied by pain or discomfort, it is still recommended to consult a professional.