This study is a randomised controlled trial and the purpose of this study is to determine the effects of Passive Static Stretching of 30 seconds versus 60 seconds on the Hamstring Flexibility in adults with Hamstring Tightness.

The study is conducted in Rehabilitation department of Fauji Foundation Hospital on the sample of 38 participants. Hamstring flexibility will be evaluated at the beginning by Active knee extension test.

The subjects will be randomized into two group by sealed envelope method. Baseline assessment would be done by using tools of SLR and modified knee extension test and then final assessment will be done after 4 weeks.

The purpose of this study is to determine the effects of passive static stretching on hamstring flexibility in adults with hamstring tightness" adults (age : 18-45 years ) by using

1. Goniometer
2. Straight leg raise (SLR)
3. Passive Hip Flexion Test(PHFT)
4. Active Knee Extension Test( AKET)
5. Modified Knee Extension Test(MKET) Data will be collected before and after the intervention protocol for each participant.

Data collection procedure:The subjects will be advised of the training session schedule following the baseline assessment. Pre and post intervention scores will be recorded.

Inclusion criteria:

• Adults age ranging from 18-45 years
• Both males and females are included in the study
• Individuals with 90 degree hip flexion having a minimum reduction of 15 degrees in knee extension position.

Exclusion criteria :

• Old adults
• Individuals suffering from any acute or chronic co-morbidities of musculoskeletal, neurologic, cardiovascular or systemic origin
• Post-surgical cases
• Hamstring strain or any other dysfunction in past two years.