Australia's Joe Gambles sits down with Bob Babbitt to talk about this weekend's Ironman World Championship 70.3 race at Lake Las Vegas. How fast does he think the winner will go? Find out.

Australia’s Joe Gambles sits down with Bob Babbitt to talk about this weekend’s Ironman World Championship 70.3 race at Lake Las Vegas. How fast does he think the winner will go? Find out.