Why there has been a decrease in the number of deaths among children in recent decades.?

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.

It would be called procrastination. if i mark brainliest : d

I'd probably say d as you would try to reassure them that everything would be ok and that they won't come to any harm.