Brian O'Driscoll gives a fascinating work Leinster players are instructed to do in order to free up space when creating attacks.

Watch Rugby Tonight live on BT Sport all season.

Subscribe to our YouTube channel for the best videos from BT Sport ➡️ http://bit.ly/17YTeL5

Subscribe to our 'No Filter Boxing' YouTube channel ➡️ http://po.st/NoFilterYT

Twitter: http://twitter.com/btsport
Facebook: http://www.facebook.com/btsport
Instagram:http://instagram.com/btsport
Website: http://sport.bt.com