<b>Comparison of Hold-Relax Technique and Static Stretching on Hamstring Flexibility in Non-Athlete Adults: A Randomized Controlled Trial</b>

Abstract Background: Hamstring flexibility is crucial for preventing musculoskeletal injuries, yet comparative studies in non-athletes are limited. Objective: This mixed-methods study compared the effectiveness of hold-relax (HR) proprioceptive neuromuscular facilitation versus static stretching (SS) on hamstring flexibility in non-athlete adults, incorporating participant perceptions. Methods: Twenty healthy non-athlete males (aged 20–36 years) were randomly assigned to an HR (n=10) or SS (n=10) group for a 6-week intervention. Hamstring flexibility was measured using the sit-and-reach test. Semi-structured interviews explored participant experiences. Paired and unpaired t-tests analyzed quantitative differences (p&lt;0.05), and thematic analysis evaluated qualitative data. Results: Both groups improved significantly (p&lt;0.05). The HR group showed greater mean improvement (7.2±3.10 cm) than the SS group (4.3±2.7 cm, t=0.834). Qualitative findings revealed HR participants reported higher engagement and perceived effectiveness, while SS participants valued simplicity but noted lower motivation. Conclusions: HR is more effective than SS for improving hamstring flexibility, with qualitative insights highlighting its engaging nature. This mixed-methods approach supports HR’s utility in rehabilitation. Future research should explore physiological mechanisms and broader populations.