A prop's main role is to scrummage, support in the line-out, tackle and hit the rucks and mauls.
No matter how fast and powerful the game becomes, a prop will always be a prop.
The difference nowadays is that props also have to be able to catch, time a pass to put team-mates into space and run.
Many top props are now very powerful runners and you may even see the odd sidestep.
The tight-head prop is very much the fulcrum. He anchors the whole scrum and is destructive in a negative sense.
He will be trying to put the opposition loose-head under pressure.
England's Phil Vickery is my idea of a perfect modern prop
The primary role of the loose-head, on the other hand, is to look after the hooker so he can get a clean strike at the ball, but these days loose-heads have to be destructive too.
The tight-head plays on the right of the front-row and mainly uses the right-hand side of his body, whereas the loose-head's left side dominates.
Because of this it is fairly rare to find someone who can excel at both.
To be a good prop, you've really got to enjoy the position - it's not everyone's cup of tea, putting your head where it hurts.
It's possibly the only true position on the field where you actually have a one-on-one with your opposite number and I relished that aspect of it.
You need to love that confrontational challenge to get the most out of it.
England's Phil Vickery is my idea of a perfect modern prop.
He's a fantastic scrummager, great in the line-out because he is quite tall, he has good hands, contributes all around the park and regularly tops the tackle count.