When surrounded by opposing players, the Ground Pound perk sends your player into the air. When he lands he will do a devastating tackle that knocks down nearby opposing players. The Bombs perk allows you to throw bombs at other players, knocking them down at a distance.
Various strategies
On offense, you have a choice to Run, Pass, or Kick play. Tap to hike the ball to the quarterback, who can pass it to the best receiver. You will now have control over the ball runner. Swipe in a direction to move him. You can punch opposing players that get in your way by tapping on them until they see stars. Swipe in the direction of defender who is trying to tackle you to do a spin. This move may also knock some of them down. On defense, quickly select which player to be controlled. When defending against a receiver, swipe towards him to try a tackle.