Posture correctors are supportive braces that gently pull shoulders back and align the spine to combat slouching from desk work, phone use, or weak back muscles. Figure-8 harnesses suit upper back/shoulder issues; full-back belts cover lumbar support; magnetic models add pain-relieving therapy. Benefits include immediate feedback to break poor habits, reduced neck/shoulder/back pain, improved breathing/confidence, and muscle retraining over 4-6 weeks when paired with rows, planks, and stretches. Start with 15-20 min sessions 2-3x daily, gradually increasing to 1-2 hours; wear under clothes during work, not sleep/exercise. Combine with ergonomics for lasting results overuse weakens muscles.