Heimildir
https://www.verywellfit.com/what-is-resistance-training-3496094
https://kidshealth.org/en/teens/exercise-wise.html
https://www.psychologytoday.com/us/basics/dopamine
https://www.webmd.com/depression/guide/exercise-depression#2
https://www.mayoclinic.org/diseases-conditions/depression/in-depth/depression-and-exercise/art-20046495
https://www.helpguide.org/articles/healthy-living/the-mental-health-benefits-of-exercise.htm/
https://en.wikipedia.org/wiki/Endorphins
https://cathe.com/5-brain-boosting-chemicals-released-during-exercise/