Lions 2013: Brian O'Driscoll explains why he was inspired by Jonathan Davies' performance against Waratahs I am often asked about the difference between inside and outside centre. The whole 12 and 13 thing is a fallacy. In the modern game, you have to be adaptable. When set-piece is finished, numbers on jerseys mean nothing. I have always switched between 12 and 13. Predominantly I have defended at outside centre. For certain plays, I have switched in. You use the strengths of certain individuals for different plays. It is about being smart and unpredictable. Australia are a clever team and will have done their analysis, so it is about showing some stuff but holding other things back. To see Jamie simply as someone who carries the ball up is far too simplistic. He might bang it up, but then comes the little offload. There is a whole bag of tricks there. It is a game of chess as to what you come up with. And that is how it will be against the Wallabies. We have had seven call-ups and, gosh, we are only just entering Test week. You would have to anticipate one or two more. You now almost expect at least one guy in every game to be affected by some form of injury. Not badly injured but out of commission for a couple of weeks and, in a compressed tour, that might be enough to cost you. Over a season you might need the odd niggle to freshen up. That slack is not there on this trip. You need to be out there playing and cannot miss more than two games. If you do, you are replaceable. I do not have a theory as to why there are suddenly so many injuries. The coaching staff have been great as to how much time we spend on our feet in training. The sessions are short, sharp and intense. On the tour here in 2001, we were flogged. Most of the injuries are in the backs. Perhaps we going soft! Remember that there are still five games left. We are only halfway through. There is still so much that can happen. Who is to say that any one of the guys just arriving now - Billy Twelvetrees, Brad Barritt, Christian Wade - might not be involved in the second or third Test? Look at how Scotland scrum-half Andy Nicol got pulled in from leading a tour group on the Friday before the third Test in 2001. We were talking the other day about Andy Farrell. He is still there in the gym, smashing it up. We told Faz Jnr that his dad could still do a job for us. Owen agreed, although he said that his dad would not be able to get out of bed the next day. You can see Andy still has the competitive juices flowing in him. You can hear it in the way he talks. His energy has been brilliant on this trip. The first Test is always a big moment. The 2001 equivalent at the Gabba was a great occasion. To witness the sea of red as we ran out made us think that we were at home. The Aussies got a shock but we cannot rely on that happening this time. We can rely only on the work that we have done, on our skill level, intensity and togetherness. We are out to test them in every way. They have not played in three weeks and we have to see if we can take advantage of that. These warm-up games are a means to an end. The first Test is the start of the end. We have to peak for that. Saturday against the Waratahs was a great run-out in that regard. Jamie Heaslip told me that he felt that the intensity was superior to the games he had experienced before. There was a plenty going on and that was good preparation. The whole squad is going to Canberra for Tuesday's match against the Brumbies. It is important that you bounce around as a squad. The midweek games are not as important to the punter but they are to us. You cannot disrespect your team-mates by thinking it is not as big a deal. You support the squad. It will be tough in Canberra but we will all be there. We will need that spirit in Brisbane on Saturday. Follow the Lions" Legendary Journey with HSBC's interactive experience at youtube.com/LionsHSBC.