Effect of Breathing Exercises and neck exercises on neck muscle and Balance in smartphone users

INTERVENTION: Intervention1: respiratory vagal nerve stimulation and postural correction exercises: Respiratory vagal nerve stimulation through slow diaphragmatic breathing (6 breaths/minute) combined with postural correction exercises. Intervention administered for 14 days under supervision. Control Intervention1: Combined effect of respiratory vagal nerve stimulation and postural correction exercises: Breathing based vagal nerve stimulation and exercises to correct posture. Control Intervention2: Conventional Physiotherapy: Conventional physiotherapy including cervical stretching and strengthening exercises administered for 14 days. CONDITION: PRIMARY OUTCOME: Joint Position Error (measured in degrees). ; Timepoint: Baseline (Day 1) and Post‐intervention (Day 14). SECONDARY OUTCOME: Secondary Outcome: ; Romberg Test performance/balance assessment.Timepoint: Baseline (Day 1) & Post‐intervention (Day 14). INCLUSION CRITERIA: Smartphone users within age group of 18‐35 years. Both males and females will be included. Individuals with Smartphone Addiction Scale score more than 31 for males and more than 33 for females.