Hi,
I did W1D2 yesterday, and it was OK. I started C25K about a year ago but only made it through a few weeks of the program before the weather got too cold (I am a native Arizonan and a wimp with exercising in the cold). I have been searching for something that would motivate me enough to stick to losing weight. My younger son is into Track & Field, we have a good relationship, and he would get on the scale in my bathroom and taunt me that he ran and he just lost weight - still not motivating enough.
About 10 years ago I had heart problems and used the treadmill at a gym and I really didn't like it. Once I was cleared by my cardiologist I decided to try "karate" at the school my boys were taking lessons. This was way outside my comfort zone, but they had excellent instructors. I got really fit, and I really ended up liking it, especially since it was indoors 
A few days ago I saw a Groupon for a 5K Neon Run, suddenly I felt like I finally found a goal I was motivated about! How fun would it be to run through sprinklers of neon glow water and be covered with different colors under black lights!! It is 9weeks away, so I talked to my son, since I figured he would want to do it as well, and I made it clear my motivation was to be able to jog/run as much as possible, but I wanted to do it for the fun of the experience, not competition like he would.
My biggest fear doing C25K is sore muscles keeping me from doing the next day. Of course I was sore after the first day, the next day I walked and jogged a little for a mile for an easy "reactivation" of the same muscles which I know helps. Yesterday when I got home from W1D2 I asked my son what was the best thing I should do after my workouts. He said to run the shower on cold over the muscles I exerted because that helps get rid of the lactic acid (which is why they get sore), and to use a foam roller (he doesn't believe in stretching as much as I do). I have bought many various gadgets for him for his workouts/muscles, I did not choose the foam roller since I know that would take more time than I would stick with so I asked for my MuscleTrac he keeps in his track bag and used it. I also put BioFreeze on my legs after the first day and took magnesium before going to bed.
Sorry this got so long, just figured I would give some background info. With the karate classes I would get distracted by the class & other students, but with running it is more difficult given it is self-directed.
Would love to hear any other tips for avoiding sore muscles.