A relay race blocking system for alerting an outgoing runner when to start running to receive a baton from an incoming runner includes a waiting plate being positionable on a running track a predetermined distance from an exchange zone marked on the running track. A starting plate is positionable on the running track a distance from the waiting plate opposite the exchange zone. The starting plate indicates an area to alert the outgoing runner to begin to run toward the exchange zone when the incoming runner crosses into the area indicated by said starting plate.