Ha ha. Such is also the case with me. After exercise. We always unconsciously want to test and show our strength. So the limbs look a little stiff, which should be what you said is a bit like hunchback. . .

If possible, I suggest you. Do 5 minutes relaxation exercise after fitness. Then continue to practice standing posture. Stand as straight as possible. Neck back. Make your back look straight. Besides, you can try to shrink your lower abdomen. This will make the chest muscles more obvious. I had the same problem as you before, after my father taught me. I will do this. It's changed now. . .

Remember to adopt it if it works!