stretching can prevent
varicose veins
o heart attacks
obesity

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. 

They ask for check ups

It is called procrastination, doing something else to avoid a specific task.