Four sprinters, in the same designated lane, each run 200m to complete two laps of the track. During their individual legs they have to carry a baton that must be passed to the next runner within a 20m changeover box that’s situated 10m before and 10m after the start of each subsequent leg. The outgoing runner usually runs at full speed with an arm stretched out behind in order to receive the baton. Failure to adhere to the baton-changing rules results in a team’s disqualification. Slick handovers can compensate for a lack of basic speed – but dropping the baton is a regular occurrence.