The study will be randomized controlled trial to determine the effects of lumbosacral mobility program on muscle length in sedentary young adults with tight hamstrings. Only the eligible subjects who fulfill the inclusion criteria will be included in the study. A sample of 78 subjects will be taken and randomly allocated into two groups with 39 each. Group A will be given three treatments. Manual therapy, mobility exercise therapy and home based self stretching program. Manual therapy mobilization posterior-anterior glides at lumber facets joints, transverse glides at spinous process & Posterior-anterior glides at SI joint. Glides will be performed 3 times with 5 repetitions. Mobility exercise therapy (Single knee to chest, double knee to chest, Lumbar rotation, Lumbar extension, Pelvic tilting). A total of 30 min sessions three times a week on alternate days for 1 week & home-based self-stretches program twice a day for three times a week on alternate days for 1 week. Group B will be given home-based self-stretching program twice a day for three times a week on alternate days for 1 week .The baseline values of all the dependent variable will be recorded on day one and at the end of the 1-week treatment session, using goniometry, active and passive knee extension test, passive straight leg raising and lower extremity functional scale will be used

The hamstring muscle group consists of four muscles (semitendinosus, semimembranosus, biceps femoris long head, biceps femoris short head). It's a two-joint muscle working simultaneously to act as a hip extensor and knee flexor. It also functions to maintain the stability of the knee joint. The hamstring plays important role in daily activities like running & walking. A lot of factors affecting hamstring function, one of them is flexibility, it is defined as the extent to which muscle length contributes to maximal joint range of motion. It is a well-known muscle of has a shortening tendency. There are many methods for treating hamstrings flexibility/tightness/shortening. Routinely, physiotherapists are using stretching & strengthening exercises, instruments assisted in soft tissue mobilization. The current study focuses on two treatments manual therapy & lumber mobility exercises

Inclusion Criteria:

• Age 20-30 years
• Sedentary life style
• BMI < 23 non-obese
• Hamstring shortness ≥ 20° using the active knee extension test (aket)
• No history of orthopedic/neurologic disorders in the lower extremity
• No history of back pain in last 2 weeks
• No contraindication for using manual therapy
• No joint limitation in the lower extremities

Exclusion Criteria:

• Any systemic soft tissue and bony disease
• Fracture
• Neuropathy
• Congenital deformities of spine