Trying to get back into shape!

Hello everyone. I am a former collegiate runner who graduated and basically quit all forms of exercise and began eating. Now I am on the brink of turning 30 and my wife is pregnant with our first child. Both of those are motivation for me to get back into shape. In addition to those two things I feel like I have been living as a hypocrit the last 7 years. I am a PE teacher and cross country and track coach. I have gotten so far out of shape that I can not run a course with the runners I coach at what they would consider a very very slow pace. So it is time to get into shape so I can have more fun with my upcoming little one, enjoy my 30's, and start leading the kids I coach by the example I set.

I am looking for motivation and I hope I can provide some in return.

Thanks!