Accelerate by driving your feet down and back, and decelerate by dropping your hips back and down, keeping your feet apart and taking smaller steps.
World Rugby has reportedly conceded Aaron Smith's disallowed try in the World Cup final should have stood.
"It is not only useful for staff who are experienced but a valuable tool for those subject staff who have to take teams."
The variety of sessions across sports - sometimes we steal session ideas from one sport and use them with another.