What’s the difference between physical activity and physical exercise?

Physical activity can be anything; like fishing and etc. But physical exercise is exercise.

Explanation:

take a nice, long walk. walk, feel the wind through your hair and your it is very relaxing.

a. steroid--> influences moods in the limbic system

b. inhalant--> dissolves fatty tissue in the brain

c. marijuana--> changes how the hippocampus processes sensations