Blockers and pivots try to help their own team's jammer get through the pack, and they try to slow down the other team's jammer. When the jammers are near the pack, everyone is allowed to bump into each other. If someone is trying to push someone from the other team out of the way, then they have to be careful how they do it. They can only push from the side, and they have to use their shoulders, the top part of their arms, their hips, or the top part of their legs—so tripping, shoving, punching, or pushing the other team's players from behind is not allowed. Or you will get a penalty 