51 - In volleyball, 5-1 refers to a formation where there are five hitters and one setter. It's one of the most popular offensive systems in the game and offers a variety of attacking options: 1. Formation: The setter usually plays right-front and right-back and remains the setter for the entire game. The other five players are offensive players who have defined roles, and their offensive role doesn't change based on their position on the court. 2. Flexibility: The 5-1 system is more flexible than a 6-2 system, which has two setters. 3. Consistency: The setter's position provides consistency. 4. Variations: Variations can be applied based on the opposing team's skills. For example, a team can use two setters, with a tall setter blocking in the front and a quick setter helping with back-court defense. 5. Challenges: If the setter takes the first ball, the libero usually steps in to set, which can take the middle hitter out of the offense. 6. 51 set: The 51 set is a first tempo set meant to beat the blockers by speed and to create openings for the outside hitters by getting the middle blocker of the other team to commit block on the middle attacker. This set is highly dependable on the hitter, which makes it more challenging.