Cross-training involves playing a variety of sports for exercise performing different types of cardiovascular exercise performing a variety of resistance training exercises all of the above

Cross-training involves all of the above. It involves exercising in a variety different ways in different sports. Hope this helps! :)

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.