I used to be an obsessive jogger, I ran almost every day for 45 minutes up to an hour and a half. But than I graduated, got a job, moved out of my parents house and I stopped running because I didn't have enough time to run on a daily basis. I would start running again for a couple of weeks, but then stop once again. But now I'm back on track
I'm currently doing a start to run program, 5 km to 10 km in 9 weeks. I like that it gives me a goal: in ... weeks time you'll be able to run 10 km. I run 3 days in a row and then take a day off. I'm hoping to get into shape fast enough to be able to run the Antwerp 10 miles in April. I would say I'm in good shape right now. Not great, but good.
Tried Insanity a while ago, and I actually liked it. At one point I did almost throw up, but it really is very intense. Made it to the fourth week but then stopped. I don't know why. Maybe I'll give it another go in the summer.