Arm 1 - Control Group Arm Title: Control Group Arm Type: Active Comparator Description: Participants in this group will receive standard physiotherapy interventions commonly used for the management of lumbar disc herniation.

Intervention Intervention Name: Conventional Physiotherapy Intervention Type: Behavioral Intervention Description: A traditional physiotherapy program including supervised stretching, strengthening, and mobility exercises tailored for individuals with lumbar disc herniation.

Assigned Arm: Control Group

Arm 2 - Experimental Group Arm Title: Experimental Group Arm Type: Experimental Description: Participants in this group will receive a virtual reality-based exercise program designed to improve balance, reduce pain, decrease kinesiophobia, and enhance quality of life.

Intervention Intervention Name: Virtual Reality Exercise Program Intervention Type: Behavioral Intervention Description: A structured virtual reality-based exercise protocol including balance, core-strengthening, mobility tasks, and functional training tailored for lumbar disc herniation.

Assigned Arm: Experimental Group

TENS, superficial and deep heat therapy, and interferential current + strengthening, stretching, and postural correction exercises Three times per week for six weeks, each session lasting 40 minutes,

The ODI is a 10-item questionnaire developed to assess functional impairment in individuals with back pain. It evaluates changes in self-care, lifting, walking, sitting, standing, sleeping, social life, travel, and pain. Each item is scored from 0 to 5, with the total score ranging from 0 to 50. The total score is then multiplied by 2 and expressed as a percentage, with higher scores indicating greater disability

The SF-36 assesses quality of life across eight domains: physical functioning, bodily pain, general health perception, vitality, mental health, social functioning, and physical and emotional roles. Its validity and reliability in Turkey were established by Pınar et al.

The TSK is a 17-item self-report questionnaire using a 4-point Likert scale to assess fear of movement and/or reinjury. Total scores are calculated by reverse-scoring items 4, 8, 12, and 16, with possible scores ranging from 17 to 68. Scores of 37 or higher indicate a high level of kinesiophobia

The Beck Depression Inventory (BDI) is a 21-item self-report Likert-type scale used to determine the frequency of depressive symptoms. Items are scored from 0 to 3, and the scale's validity and reliability in Turkey were established by Ulusoy et al.