Swim one full stroke cycle over the water diving underwater to kick three dolphin kicks before resuming one full stroke on the surface. You must drop your head down underwater to allow your hips to lift, you are then able to kick underwater. This will develop the undulation of butterfly and a good hypoxic drill for improving your lung capacity.
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.