WEBSITES
https://www.mars-one.com/
http://dwteach.com/
http://www.normalbreathing.com/c-effects-of-exercise-on-the-respiratory-system.php
http://www.fitday.com/fitness-articles/fitness/exercises/why-exercise-boosts-the-immune-system.html
http://www.livestrong.com/article/123164-effects-exercise-body-systems/
https://www.mars-one.com/
http://dwteach.com/
http://www.normalbreathing.com/c-effects-of-exercise-on-the-respiratory-system.php
http://www.fitday.com/fitness-articles/fitness/exercises/why-exercise-boosts-the-immune-system.html
http://www.livestrong.com/article/123164-effects-exercise-body-systems/