I just signed up for the Corporate Challenge 3.5 mile race in Boston on June 15. I don't do much running anymore due to knee problems, but I can manage a race this short with just a few training runs and my usual cycling. As I told the team captain, if I train alot I won't be able to run, but if I train a little I'll do fine (well ~9 min/mile but that OK). There is one 0.3 mile hill on my 13 mile commute to work that keeps me in pretty good shape. I agree with triflor that standing hill climbs on the bike mimic the running motion. Before I ever started running, I could never climb out of the saddle. After I began running, a standing hill climb felt like a natural motion.