...* [Mayo Clinic](https://www.mayoclinic.org/healthy-lifestyle/fitness/expert-answers/pnf-stretching/faq-20057741)
* [NHS](https://www.nhs.uk/conditions/stretching/)
##Hashtags
* #Pnfstretching
* #PNFstretchingexercises
* #Pnfstretchingprotocol
* #Pnfstretchingtechnique
* #flexibility