A back is one of the seven players that stands outside of the scrum in a Rugby game and do most of the passing and running with the ball.
Its someone who can play centre across all the positions in a rugby teams back position
no# 15 is a full back in rugby union
The current England rugby full-back is Ben Foden. Hope this has helped! =)
A rugby player can deliberately knock the ball back, but he/she cannot deliberately knock it forward.
The half-back (no.7)
The first player ever to do this was welsh ledgend Jonhathon Davies.
as far back as he wants to