Kima is an athlete and weighs more than her sister, who is the same way. what could be the reason?

The very obvious answer could be that Kima has more muscle weight because she is an athlete. Athlete's have, on average, more muscles than an average person, because they need the extra muscles to help them support their physical activities. However, it is also possible that Kima is heavier than her sister due to the fact that she is overweight. However, I would say the answer because she has more muscles is the correct one. 

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The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)

By placing 2 fingers at the sternum (the spot where the lower ribs meet) the put the heel of your other hand next to your fingers. hope this