...when the jam goes the full 2 minutes, and you've been skipping cardio. Remedial Roller Derby: Each jam (unit of play) can last up to 2 minutes, but can be called off by the Lead Jammer whenever she wants. Jams seldom go the FULL 2 minutes, unless there's no lead jammer (usually because the lead jammer got a penalty during the jam, thus losing the "lead" status)

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