Which training principle states that exercising a certain body part are practicing a particular skill primarily develops that part or skill

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other. 

Well i guess u know a lot of that, huh? that's nasty of me, isn't it? lol

Answer(b) a diet high in fiber and low in saturated fats;