Players run around dribble with two different balls.
Just dribble, don't care about the rhythm.
Part of coordination-training : get the feeling of handling different sizes and weights of balls which makes players aware of the feeling how to handle balls in different situations - fast hard passes or gentle passing.
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.