A straight and upright posture can be achieved if the upper back muscles are strong and well trained.
Put a stability ball in the middle of a gymnastics mat. The toes are on the ground. The legs are a little more than shoulder width apart. Have the band going under the ball, so that it is directly under your shoulders.
Start with an exercise band that is not too difficult, and hold it in both hands close to the ball. Slowly pull your arms backwards by bending the elbows. The abs should be engaged during the entire exercise and the head and neck form a line. Repeat the exercise 10-12 times.
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