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- Teams have four blockers and one jammer on the track at a time. The blockers skate together in a group called a pack. The jammers score points by lapping the pack. Roller derby teams try to have the most points at the end of the match to win. Matches are not allowed to end in a tie. An overtime jam occurs to determine the winner if needed.
- Roller derby positions include one jammer, one pivot, and three blockers per team on the track. Jammers wear a star and score points. Blockers try to stop the opposing jammer from scoring.
- Good blockers have quick footsteps, strong shoulders and core, and the ability to jump.
- Beach volleyball teams have two players per side. The goal is to hit the ball over the net into the opponents’ court, where they cannot return it legally. Rallying continues until one team fails to return the ball.
- Analyzing recurring blockers helps prevent repeated work disruptions. The more details collected about blockers, the more their impact on work can be understood and reduced.
