14.https://amerisleep.com/blog/exercise-and-sleep/
16.https://www.health.harvard.edu/staying-healthy/exercising-to-relax
18.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1470658/
19.https://www.medicalnewstoday.com/articles/how-does-exercise-reduce-stress
20.https://www.excellenceinfitness.com/blog/how-exercise-boost-self-esteem
21.https://www.livestrong.com/article/438937-how-does-exercise-affect-your-self-esteem/
22.https://www.myzone.org/blog/users/improve-your-self-esteem-with-exercise
23.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5934999/
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