First, take a moment to sit in Dandasana (Staff Pose): Come to a seated position on the floor with your legs extended in front of you; or sit in a chair, with your spine stacked over your hips and your knees bent, feet flat on the floor. Now, place both hands next to your hips, press your palms down into the ground, take a deep inhale, and notice how you feel. Then, let your shoulders cave in toward your chest, and allow your head to come forward and chest to collapse, and notice how you feel.
It may appear to be subtle at first, but practicing mindful posture, especially over time, not only dramatically affects how you feel physically, but energetically as well. Those who practice sitting or standing with mindful posture, claim to feel far more alert, happy, and confident. Versus people who subconsciously slouch, claim to feel blue, fatigued, and unmotivated.
Physical imbalances Due to Posture:
It is important to look at the physical imbalances this misalignment creates. When you're in a slouching position, your shoulders are internally rotating, causing an action of contraction in your upper body. Additionally, the chest muscles that draw your arms and shoulders forward and together, as well as the muscles in the back and side of your neck that hold your head forward, get overworked, which can, over time, result in pain. Pain doesn't equate to feelings of happiness
Energetic Imbalances Due to Posture:
Let's face it, emotions are energetic. Because we are infinite sources of energy, our emotions not affect how we feel, but also how we connect with others. Consequently, when your chest is concaved, your heart chakra (Anahata) is closed off from giving and receiving love and compassion. Mindful posture grants us an expansive quality in our hearts both physically and energetically.