Best practices in early childhood are that - has/have pediatric first aid and pediatric CPR certification:
A. One staff member
B. One staff member in each class
C. All staff members
D. Only the director

C. All staff members but possibly B. One in each class. However I believe C is most correct from what I know in my school district.

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.