The greatest benefit is in what zone of your maximum heart rate? A. 25%-50%

B. 50%-85%

C. 85%-100%

Answer-
B. 50%-85%
Because in all zones it needs to be under 80%

B.50%-85% but it might be c.

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.