During a relay race, members of a team take turns running, orienteering, swimming, cross-country skiing, biathlon, or ice skating (usually with a baton in the first) parts of a circuit or performing a certain action. Relay races take the form of professional races and amateur games. In the Olympic games, there are several types of relay races that are part of track and field. A swimming relay of four swimmers usually follows this strategy: second fastest, third fastest, slowest, then fastest (anchor). However, it is not uncommon to see either the slowest swimmer racing in the second slot, creating an order as follows: second fastest, slowest, third fastest, and then fastest, or (2) an order from slowest to fastest: slowest, third fastest, second fastest, fastest. In athletics, the two standard relays are the 4x100 metre relay and the 4x400 metre relay.