By Jeremy Guscott - Former English and Lions centre.
There isn't too much difference between the inside and outside centre.
But as a rule, the outside centre tends to be quicker, but not maybe as big as an inside centre.
England's Mike Tindall, who has played most of his international rugby at outside centre, has the ideal build for the number 13 shirt.
He's a hard, straight-running centre who tackles well, who takes the ball into contact well, which perfectly complements the skills for a number 12.
It used to be that the centres had an understanding but these days the whole backline has to have an understanding.
As a coach, you run through repetitive exercises, drills and playing alongside one another to work out what you are going to do.
If you don't then there's no rapport built.
Hopefully, you get enough opportunities to work out what each other is going to do.
The Ruggas 2017 Drafts was done as shown below.
Quagga - Mitchelle vd Merwe (Potch Gim)
Shawn - DJ Falconer (Rondebosch)
BMT - Divan Enslin (Boishaai)
Sabbat - Rikus Pretorius (Grey Coll)
Hooit - Kennedy Mpeku (KES)
Kattes - Jeremy Randall (Helpies)
Charl - Sicelo Tole (Muir)
Beet - Matt More (St Andrews)
Louis - De-An Ackerman (Diamantveld)
Carl - Oliver Schuurmans (SACS)