Oxygen deficit
the state of the muscles not receiving the amount of oxygen they need to produce the amount of energy necessary for movement
A), recovery time! You should let your muscles recover after intense workouts.
Volleyball is considered a good aerobic exercise because you’re on your feet while playing, you’re working the same large muscle groups for more than 20-minute intervals and you have the opportunity to maintain 60 to 80 percent of your target heart rate.
Your answer is preschool age