What strength training do you do with c25K?

Hi all! I was thinking about starting the c25K program (not training for anything specific right now, just need a new goal to work on). I noticed that it only has you running 3 days per week, so I figure it's fine to do strength on the alternating days (with a rest day thrown in too). So, for those of you who do both, what type of strength training do you do?