In terms of rifle support, which position is commonly used for competition?

The prone position is commonly used for competition because it offers the most stability and accuracy for the shooter. When a competitor is in the prone position, they lie flat on their stomach with the rifle supported by the ground or a bipod. This position minimizes movement and allows for a solid point of contact between the rifle and the shooter's body, which greatly enhances precision when aiming and shooting.

In competitive shooting, where accuracy is paramount, this stability is crucial. The body's alignment, combined with the use of natural points of aim, allows for a more controlled and steady shot. Additionally, the lower center of gravity when lying prone contributes to better control compared to other positions.

While the kneeling, standing, and sitting positions also have their uses in shooting sports, they generally do not provide the same level of support and accuracy as the prone position, making it the preferred choice in high-stakes competitive environments.