They are generally short since they play in the back row and must be near to the ground to play defense. It also helps to be tiny and fast in order to be in the proper position to play defense and receive serve.
The libero wears a different colored uniform than the other players. The libero's uniform consists of white pants and a white shirt with "libero" written in blue ink on the front of their jersey. A libero cannot have numbers on their uniform nor can they wear any type of badge or insignia. The libero is the only player who is allowed to touch the ball with their hands while it is in play; therefore, they are responsible for keeping track of time. As soon as the ball is out of bounds, the libero is allowed to pick it up and pass it to another player.
There used to be liberos on professional tennis tours, but because there was no open spot on any team sport's Olympic roster, the role disappeared. However, it has made a comeback in basketball and volleyball. Women's volleyball has two players per team who share duties as libero. In women's basketball, there is now one libero per team. They are usually assigned the role of setter for their team.
Short players can negotiate the space easier on a decreasing playing field if their style of play is to keep the ball on the ground. They have a lower center of gravity, can remain on their feet better, and play a so-called tiki-taka style around their ever-taller opponents.
The average height of a male soccer player is 5'9" while that of a female player is 5'0". This is because most soccer teams in Europe and North America are set up in a 3-4-3 or 3-5-2 formation, which is why you will often see shorter players on the outside looking in. The exception is England where players are generally taller because they tend to play a more direct game.
There are several factors that influence a player's height including genetics, age, gender, body type, and childhood nutrition. Genetic potential determines how tall someone can become through growth hormones. Genetics also play a role in how fast people can run and how strong they are. For example, some children's legs grow faster than others causing them to reach puberty earlier. This allows them time to train with the team before their bodies stop growing.
Age affects how much weight people carry around by using muscle more as they get older. Body types vary between heavy people who carry more fat and thin people who carry more muscle. Childhood nutrition influences bone development which leads to taller people having healthier bones.
For your novice or intermediate teams, keep it basic. They can jump and swing if they are in the back row and are behind the 10' line when they leave the ground. Are you standing in front of the 10 'line (or walking on it)? Instead, use Downball. The game is exactly the same as upball except that instead of jumping and swinging a volleyball, you drop it down to the court before running back up with it.
Volleyball rules include: You can only hit the ball with the face of your hand. You can't kick it, spit on it, or use any other part of your body except your hands and arms. If you do any of these things, you will be called for a foul. A free shot is given to your opponent if they touch the ball out of bounds. You have the option of serving again or not. If you don't serve again, the point is over. If you do, then the action continues until someone touches the ball out of bounds or commits another foul.
Downball is played just like upball except that instead of jumping and swinging a volleyball, you drop it down to the court before running back up with it. This makes sense because most people can't jump that high anyway. Also, since you're dropping the ball, you need something to hit it with. Your hands and arms are used for hitting the upball so they should work fine for dropping balls too.