Use of PNF and Tissue Flossing to Treat Hamstring Tightness in Young Female Students

The goal of this clinical trial is to learn tissue flossing and proprioceptive neuromuscular facilitation effect in treating hamstring muscle tightness. The main questions it aims to answer are: 1. which technique is more useful in giving instant relaxation of hamstring muscle 2. can these technique increase muscle flexibility and knee motion Researchers will compare Tissue flossing to a PNF (Proprioceptive neuromuscular facilitation) to see which on is more effective. Participant will: 1. be provided one technique either tissue flossing or PNF in first day 2. physiotherapist will immediately measure the the change in flexibility or knee motion 2\. another technique will be applied after 1 week 3. again change in flexibility and knee motion will be recorded