3.https://www.ahajournals.org/doi/full/10.1161/01.CIR.0000048890.59383.8D
4.https://www.health.harvard.edu/heart-health/the-many-ways-exercise-helps-your-heart
5.https://www.healthline.com/health/exercise-fitness/muscular-strength
6.https://www.betterhealth.vic.gov.au/health/healthyliving/resistance-training-health-benefits
8.https://healthpromotion.msu.edu/fitness/benefitsofphysicalactivity.html
9.https://www.nia.nih.gov/health/four-types-exercise-can-improve-your-health-and-physical-ability
10.https://www.sleepfoundation.org/physical-activity/exercise-and-sleep,
11.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4341978/,
12.https://health.clevelandclinic.org/how-exercise-affects-your-sleep/
13.https://thesleepdoctor.com/exercise/