Put your posture right first. Good posture is the foundation. If you don't know how to correct it, there are many ways, such as going to a regular hospital to see a doctor and go to the rehabilitation department for correction, or downloading a fitness software at home, which has a tutorial and slowly recovers the correction.

I've read the words you gave me to describe your bad posture, which is quite professional.

Adjust your posture first, then consider practicing your muscles. Mm-hmm. If you have the habit of running, remember to stretch before and after stretching.