Active. https://www.active.com/walking/articles/forget-the-gym-why-a-brisk-walk-is-a-really-great-workout-4064
Diakses 4 November 2019Mayo Clinic. https://www.mayoclinic.org/healthy-lifestyle/fitness/in-depth/walking/art-20046261
Diakses 4 November 2019Science Daily. https://www.sciencedaily.com/releases/2019/11/191101093903.htm
Diakses 4 November 2019Verywell Fit. https://www.verywellfit.com/benefits-of-speed-walking-3436249
Diakses 4 November 2019Verywell Fit. https://www.verywellfit.com/how-to-use-interval-walking-to-lose-weight-3495456
Diakses 4 November 2019