Ortho Info. https://orthoinfo.aaos.org/en/staying-healthy/safe-exercise
Diakses pada 4 November 2020Mayo Clinic. https://www.mayoclinic.org/healthy-lifestyle/fitness/expert-answers/exercise/faq-20057916
Diakses pada 4 November 2020Healthline. https://www.healthline.com/health/fitness-exercise/at-home-workouts
Diakses pada 4 November 2020NHS. https://www.nhs.uk/live-well/exercise/flexibility-exercises/
Diakses pada 4 November 2020