Especially in the traditional standard posture, the waist of this posture borrows a lot, and the waist is not suitable for high-frequency practice, so we must give time to recover. 1 twice a week is not enough (of course, it refers to the practice block, which has a certain intensity)
You can change your posture and move slowly. One is to reduce the load on your waist, and the other is to give the target muscle, that is, the abdominal muscle, new stimulation. Even if you are not injured, you can't practice an action until you die.
In fact, there are many reasons for joint noise. If you don't practice too much and don't feel uncomfortable with this noise, just ignore it. I also have joint ringing, and I have asked the doctor in many places that it doesn't hurt. The synovium is uneven and difficult to improve artificially. Without inflammation, it is not a disease.
Fitness is a good way to know the body's reaction carefully, which is beneficial to adjust the training plan to adapt to the changes in muscle growth and prevent injuries. Practice hard, man!