James
You played the position before so you know that physically you need :
1) endurance and speed, to get you to the break down.
2) You need good
upper body strength / endurance to be effective when you get there.
Other than playing rugby the best way to prepare (in my oppinion)
is:
Fartlek style running - Walk, Jog, Sprint. Mix up the intervals. Keep it as intense as you can (might be worth investing in a
heart rate monitor)
You need to play 80 mins so you train for 90.
Some form of circuit training with weights concentrating on your upper body. There are other people on this sight better qualified to give advice on this part of the training. If you ask the question in terms of a need for strength and endurance ie you need to be strong enough to rip a ball in the maul and drive a ruck. You need to be able to do this time after time. They will help.
Finally, I know you are thinking mostly about your ability to hack it physically, but get your ball handling skills up to scratch. Get mates, young relatives ect to throw / kick the ball to you.
Please let me know how you get on.
Cheers
Mark
mark.stacey67@ntlworld.com