I Can't Keep Doing This

I have been watching my weight go up more and more lately. I now weigh about 3 pounds less than I did when I had my daughter (my biggest baby). That is HORRIBLE. I know I have to do something about it.
I have a few things in mind. First of all, my husband and I are going to get ourselves ready to do a few 5k's this year. Another thing that we are going to do is start riding bikes more.
I have been wanting to try a 5k for a while. I really need a reason and person to push me. My reason is that I am getting go out of shape and big that I am uncomfortable. My person that will help motivate me is my husband. (Yay for Chad!) He has a book that gives a guide to getting in shape to train for a marathon. I don't see my self really becoming a marathon runner, but it will get me in shape.
When is comes to bike riding, I like riding a bike. I haven't done it much in a while for a few reasons, however. First, I had small kids. Second, my bike was vandalized, so I needed to either fix it or get a new one. Well, The small kids thing has rectified itself for now. My youngest is 7 and can hold her own on a bike ride. As for the broken bike, Chad tried to fix my old one, but it it very rusty and needs more work. Instead of continuing to work on the old bike that the ex gave me years ago, he got me an early birthday present...a new bike. It is so pretty and much easier to ride than the other one was. We went on a family bike ride this morning, and I can't wait until we can do it again!
I will try to check in to give myself a bit more accountability, but lets be reasonable here. If I say nothing, you can probably assume I am not doing so well...