It's simple you just have to pick up you weight (W) and you height (H) but
Weight in kilo gram (kg)
Height in meters (m)

for an example a person that weight is 100 kg and height is 1.80m
Using this formula

the human body has about 206/207 bones. and the human brain has about 100 billion braincells.
The answer is true. Because it will help by reducing the size.
The correct answer is C. Boys and Girls Club of America
Since someone would be performing wind sprint activities, it is guaranteed when performing any activity is to get better overtime so I would say to "work above your target heart rate"