You can pop your lower back by doing a chair twist.
To pop your lower back doing a chair twist sit upright in a chair and then interlace your hands behind your back and the chair.
Then inhale and exhale while also extending your spine backward.
You can also pop your lower back by doing a lower back rotation.
To pop your lower back with the lower back rotation start by laying on your back and raise your knees and then move your hips to one side.
Then hold it for 10 seconds and then return your knees back to the starting position and repeat on the other side.
The reason why your lower back pops when you twist is because of the gas bubbles in the fluid that lubricates your joints being released which makes the popping sound.
Another cause of the lower back popping when you twist is because of tendons or ligaments moving out of place which is called crepitus.
Most commonly though it's the gas bubbles in the fluid that lubricates the joints being released when you twist.
Just like when you crack your back or stretch your back and release the gas bubbles.
Stretching your back can put pressure on the fluid that is in your joints and cause gas bubbles to form.
And when you crack your back, the gas is then released and makes and causes the popping sound.
This popping sound is similar to what happens when you crack your knuckles.
When you crack your knuckles you release the gas bubbles and hear the popping or cracking sound.
Also when you twist your back, the ligaments and tendons may also move out of place and cause the popping or cracking sound.
Another cause is vertebrae rubbing which is when the vertebrae in the spine rubs against each other.
Most cases of back popping are normal and harmless but if you experience any persistent pain, limited mobility or changes in the nature of the popping you should seek medical attention.