This is all about defending in small numbers where it’s common for one or two defenders to find themselves in situations where they are exposed to an overload of attackers. MORE
Force inside is a defensive tactic. The nearest defender to the ball goes to pressure the opponent and block forward momentum.
The pressing player angles his body to force the opponent away from the edge of the pitch and into more crowded areas.
When using this tactic, you don’t allow opponents down the wings and beyond your defenders. By forcing inside, you keep the play in front of you and going sideways or backwards.