Neutral Spine
Your spine has a natural front-to-back curvature. When your posture allows the spine to conform to this curvature, you optimize the distribution of stress among your vertebrae and maximize the spine's effectiveness as your body's "shock absorber." When bad posture pulls your spine away from its natural curvature, you increase the stress on the discs between your vertebrae and increase the risk of pain and injury.
You should practice a position called "neutral spine," in which you allow your spine, from your skull to your tailbone, to attain its natural shape. While it is beneficial and relaxing to practice this posture whenever you find yourself standing, you should focus on attaining a neutral spine before doing any kind of weight training. Not only does neutral spine help you avoid injury, it helps to ensure that the exercises you're doing work the muscle groups they're supposed to.
You should practice a position called "neutral spine," in which you allow your spine, from your skull to your tailbone, to attain its natural shape. While it is beneficial and relaxing to practice this posture whenever you find yourself standing, you should focus on attaining a neutral spine before doing any kind of weight training. Not only does neutral spine help you avoid injury, it helps to ensure that the exercises you're doing work the muscle groups they're supposed to.