Well, I'm on week 2 now of my Couch to 5K program. I've never been much of a jogger, but I think I can handle this. It starts of easy (run 60 seconds, walk 90) and takes about 1/2 hour out of my day. I've been doing it at lunch with a co-worker (insert a "that's what she said" joke here).
It starts of slowly like an old man lowering himself into a bathtub and the running intervals get longer and the rest periods get shorter until you are running the full 5k.
So far it's been fine and it will help my cardio. Next week I'm also going to start doing 3 classes of muay thai a week (same night as my jiu jitsu) and a capoeira class that I started on saturday. I'm hoping to do a jiu jitsu tournment in August so hopefully the threat of someone kicking my ass will motivate me to work harder to prepare for it. Winning a medal is nice, but not getting your ass kicked and having it posted on YouTube is nicer.
I didn't think I would like Capoeira, but it's fun. Sorta like a cross between yoga and break dancing. Georgette said that Capoeira looks amazing when it's done right, but it doesn't look that way when I do it. Still, it's a great workout. The next day you are sore in muscles that you didn't even know you had. The class is near my house and the instructor doesn't speak english, but with my "monkee see, monkey do" skills I manage it.