Energy production is the primary means of ATP production during rest and for activities that last for 2 minutes or longer.

Metabolic
Non-oxidative
Oxidative
Kinetic

The answer should be metabolic

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.