I need advice regarding my problem.
Namely, due to large breasts, my spine hurts.
I know I need to strengthen my core, but would some relief come from wearing a posture correction belt for 3 hours – the one worn for clavicle fractures sold by Bauerfeind?

Every, and I mean every restriction of movement (it doesn’t have to be full immobilization) weakens the muscles. Braces used for clavicle fractures are no exception. They position the shoulders in their posterior position, aiming to align the clavicle fragments in a relationship from which we expect faster healing.

I understand how such support may seem attractive to patients with problems similar to yours, but by bringing the shoulder blades closer together, it further weakens the interscapular muscles and shortens them, worsening the existing painful condition.The same happens with all other elastic and inelastic braces and supports offered as a solution for either pain or posture. Initially, they seem to help, but after some time, the symptoms inevitably worsen.

The movement of the human body is a complex process developed through evolutionary “alchemy” aimed at reducing energy expenditure in movement. In this sense, it’s not only important to increase the strength of the core muscles but also their flexibility, so that through their elasticity, they reduce stress on the surrounding tissues and thus decrease the effort of maintaining a static position. Then, aerobic training (cycling, running, elliptical trainer, stepper) should help eliminate some of the consequences of long sitting or standing, for which evolution has not prepared us well. Next, exercises for the extremities should eliminate another part of the damage caused by prolonged static posture and strengthen the helper muscles of the spine. All of this should be done regularly (at least three times a week) as therapy and then as prevention of recurrence of symptoms.

The body is plastic. After some time, it will adapt to what we demand from it. If you minimize your movement, everything will weaken and atrophy, resulting in unpleasant symptoms. The remedy is simple. Do the opposite.