I wouldn't be to obsessive over running as long as you can do at least 5km, they will work you up to doing the 14km goal if that's correct info. I mean look at the min requirements it doesn't say you need to be doing 5km a day so I figure if you can, you'll be fine. I agree you'll need strength, stamina, and mental stamina, so don't worry about "beefing up" work on conditioning yourself. Check this site out for ideas on what to keep working on to keep in top shape for training. http://www.cflrs.forces.gc.ca/site/soyez_prets/suggestion_e.asp