Stop right there—without moving, do a posture check. Back rounded? Chin sticking out? Don't worry, strength training can help fix your hard-to-break slouching habits. Slouching doesn’t just visually pack on pounds; it also causes neck and back pain, decreases oxygen flow to your muscles, and reduces flexibility, upping your risk of injury. This workout combats chest tightness (which exacerbates bad posture) and strengthens the muscles that pull back the shoulder blades to build better posture.