Have you ever observed other peoples posture at Jiu Jitsu? I have noticed. Some good, fair, and bad. Bad posture will eventually cause back pain. It can be corrected.
Take a look at the picture of the guy in the blue shirt? Which posture do you have? Unfortunately, I have thoracic kyphosis but I am doing something about it. Hopefully you have good posture. Posture is important because it will prevent unnecessary back pain as you age and improve health.
Slouching stresses the spine in a way that is not natural. Rounded shoulders is bad for the back and can restrict lung capacity. It is caused by weak muscles in the back.
Sitting in a chair is the same as standing but without legs. The spine is straight not slouching.
If there is any doubt, I’m not doctor and recommend getting diagnosed by a professional.
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Great article on how to develop good posture.
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… You don’t have to be this guy!!!
journeyjjbluebelt 
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