Mixed 4 × 400 metres relay

The mixed 4 × 400 metres relay is a 4 × 400 metres relay in which teams field two men and two women, in whatever order they choose. It was introduced at the 2017 IAAF World Relays and was then held at the 2019 World Athletics Championships.

Mixed 4 × 400 metres relay

The mixed 4 × 400 metres relay is a 4 × 400 metres relay in which teams field two men and two women, in whatever order they choose. It was introduced at the 2017 IAAF World Relays and was then held at the 2019 World Athletics Championships.