Relay races normally involve four teams of four skaters. Each skater participating in the relay must complete at least one lap. Normally, the skaters will exchange turns in rotation with those not currently racing. Skaters that aren’t racing are either resting, covering the skater on the track or preparing to be the next skater racing. Instead of passing a baton, the skater on the track must tag the incoming skater to complete an exchange. In order to maintain momentum, it is more common for the incoming skater to crouch and receive a relay from behind. In the event of a fall, a covering skater may tag the fallen skater and continue the race. A gun will sound indicating that there are three laps remaining, meaning each team may only complete one more exchange. One skater must complete the final two laps, except if the skater falls.