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Pelvic floor muscles (not labelled) at the base of the body and the rectus abdominis muscles either side of the linea alba are our "Base-Line" muscles - the body's "core pillar of strength" when fully activated and elongated. Think of all movement of the rest of the body originating from Base-Line. Work on breathing with your Base-Line. Build the connection between muscles and mind.
The rectus femoris muscles - like strong poles down the front of each thigh from hip bone to shin, aligning the hip and knee joints. (The only one of the quadriceps that attaches to the pelvis, the rectus femoris correctly positions the legs to the torso when fully activated allowing the other muscles to work as they should.)
The gluteus maximus muscles (not labelled) work in tandem with the rectus femoris to support the legs through a full range of natural movement.
The trapezius muscles align the upper body and guide the head and arms through a full range of movement when they are free of physical restrictions. The nuchal ligament between the trapezius muscles should be easily palpable, but often it is not due to physical restrictions in the connective tissues of the upper body.
These 5 (paired) muscles are the ones to focus on using in order to feel how to move to improve posture and work towards a more dynamically balanced and aligned body.
Picture these muscles in your mind, feel for them activating. Develop your sense of conscious proprioception and feel how to heal.