Tight hips and lower back pain are directly linked: when the muscles around the hip joint become shortened or restricted, they alter pelvic alignment and place excess stress on the lumbar spine.
Tight hip flexors are a musculoskeletal imbalance where the muscles connecting your thighs to your pelvis become shortened and overactive due to prolonged sitting or postural dysfunction.
Lower back tightness is a musculoskeletal condition where the muscles surrounding the lumbar spine become overactivated, shortened, or fatigued - typically due to sustained poor posture or movement imbalances.
Lower back pain when standing is almost always caused by increased spinal load, poor posture patterns, or muscle fatigue - and it's almost always fixable
Flat back posture can be corrected with targeted exercises that restore the lower spine's natural curve, reduce muscle imbalances, and strengthen the core.