He can focus on progression, increasing the intensity and time he spends on the paddleboard. I use these fitness principles as well.
It would take a week or seven days because one pound is about 3,500 calories and 500x7 is 3,500. Hope that helps :)
It is B , I know this thanks to the fact I took PE and our teacher teach us about the body !
Cardiovascular is probably your answer
Cardio- the heart
Vascular- vessels
Circulatory- blood
A health risk is something that when it happens, could and/or would be detrimental to your health