Relay

Aug 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Olympic Stadium

Changeover box Baton must change hands within zone, after which runners must stay within their lanes until course is clear

20m 10m

4 x 100m handover points

Staggered start

Finish

Acceleration zone Allows second and subsequent baton- receiving runners to get up to speed

Running order

Good starter, runs opening 100m bend

Good straight runner

Good bend runner

Anchor leg – 100m sprint under pressure

Baton Aluminium tube

Length: 28-30cm

Weight: 50g

Women’s 4 x 100m anchor and London Olympics relay gold medallist Carmelita Jeter (USA)

4 x 100m

Olympic record

Jamaica 2012 36.84

United States 2012 40.82

World record

Jamaica 2012 36.84

United States 2012 40.82

4 x 400m

United States 2008 2:55.39

USSR 1988 3:15.17

United States 1993 2:54.29

USSR 1988 3:15.17

Sources: Rio 2016, Olympic.org, IAAF

Pictures: Associated Press, Getty Images