How do hormones reach the cells they affect? they move via electrical impulses. they travel through the bloodstream. they are released into specific ducts. they are signaled by target cells.

Endocrine glands secrete hormones directly into the bloodstream. The hormones dissolve in plasma and travel the circulatory pathways through various body tissues. ... Because only those target cells have receptors for that particular hormone. Some hormones bind to receptors on the surface of target cells.

Dbecause it isn't always an athlete, breathing techniques don't have to be advanced, and consistent intensity won't make it go down or stay the same