This exercise allows you to develop good body shape in all forwards - they get multiple opportunities to practice foot positions and correct body shape and movement.
Scrums are a great platform to attack from in seven's, notice the fly half (2nd reciever) is directly behind the scrum and can choose which way to attack. Key factors : Work as a unit - Strong core - Tight binding - Leg drive
A great start for learning about correct and safe body shape in beginners. Also used with advanced senior players for effective scrum preparation and warm up.
This drill is a good development for building in holding your body shape under pressure - do not use this as workout for the two players. It is designed for the single scrummager to work on technique whilst under pressure.