If your back hurts, I think your posture is wrong
Check your posture while watching videos
Make sure you don't lift or lower your butt in a straight line
The important thing is to flatten the wing bones so that they don't stick out behind your back
If you do this, your arms will hurt or your stomach will feel tight
I think the posture is wrong Make a straight line from head to toe, tighten your abdomen, and hold it tight, not your back
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