Answer:
the training of the body to improve its function and enhance its fitness. ... The distinguishing characteristic of exercise is that it is a structured activity specifically planned to develop and maintain physical fitness.
Exercise improves brain function.
Exercise delivers oxygen and nutrients to your tissues and helps your cardiovascular system work more efficiently. And when your heart and lung health improve, you have more energy to tackle daily chores.
Upstream or upriver is a term which is used when you are travelling against the direction of the flow of the river. There are some markers or symbols which are telling us something or how we should pass.
when you are travelling at dusk and you see a buoy with number 4 and a flashing red light you should keep the buoy on the starboard side that is on the right side. buoy with number 5 or any other number will indicate something different.
Evaporation would be the answer.