4 offensive players must line up on the line of scrimmage. 3 defensive gamers must be down linemen (in A 3 of four-position stance). One linebacker could blitz on possibly aspect of the middle. Defensive linemen need to line up no wider than shoulder to shoulder ("shading") around the offensive https://leisurecityguide.wordpress.com/2024/08/29/the-thrills-and-benefits-of-indoor-football/