From Under 10's up to senior's being safe in the scrummage is about good technique, regular practise and working on improving your body position. Wasps prop Phil Swainston outlines some of the key fundamentals
Revisiting the finer techniques can help to build the overall strength of your set piece, and your attack.
Before even getting to the scrum machine, you can develop your players strength through their body position.
A strong attack is built on a solid set piece, and a solid set piece depends on performing fundamental techniques well. In the scrum, this means a strong body position made up of many components. Log in to see the full version of this very useful video from Wasps community.
Coaching a safe head position for tackling is not only a "Duty of care" for coaches but it also developes great body position and the platform to drive your opponents backwards. This video shows how physical the Wasps players are but not without safety & accurate technique