What are some physical benefits of physical activity? talk about the positive effects on your heart, bones, cardiovascular system, etc. name at least three effects: 1. 2. 3.

Physical activity can:
1) strengthen the lungs so you can use more of your lungs which in turn will prevent illness.
2) strengthen the heart muscles so the number of beats per minute while exercising goes down which results in a better cool down.
3) strengthen muscles fibers to help a person better carry things and prevent tension in the muscles.
let me know if you have any further questions 
:)

The answer is corticosteroids