Provided are methods and systems of reducing, treating, and/or preventing back pain in an individual, such as a pregnant or post-partum individual, that include changing the center of gravity of the individual by the methods set forth herein. In particular, the methods herein include shifting the center of gravity in the individual to a desired center of gravity. The methods include applying modifiable lifting forces to a lower abdomen of the individual using a pully system, under the belly of the individual toward the desired center of gravity； and applying one or more vector forces from an anterior side of the individual toward the desired center of gravity. Also provided are methods that include applying a lumbar support, as described herein to an individual. Also provided herein are adjustable, modular lumbar support devices that may be used to provide lumbar and/or belly support for individuals having belly weight to achieve the present methods. According to non-limiting example embodiments, support or brace devices provided herein may be worn by pregnant women at various stages throughout a woman's pregnancy, and/or post-partum and may be adjusted to naturally contour/conform to the woman's anatomy, which changes throughout pregnancy. Further provided are kits that include at least one lumbar support device provided herein, which kits may optionally include instructions for proper application and/or adjustment of the lumbar support device and/or accessories for use with the present methods, systems and/or devices.L'invention concerne des méthodes et des systèmes pour réduire, traiter et/ou prévenir une douleur dorsale chez un individu, tel qu'une femme enceinte ou post-partum, qui comprennent le changement du centre de gravité de l'individu par les méthodes décrites ici. En particulier, les méthodes de l'invention consistent à décaler le centre de gravité de l'individu vers un centre de gravité souhaité. Les méthodes consistent à appliquer des forces de levage
