Need suggestions for workplace "get fit" challenge

Hello! A co-worker and I are at the beginning of our journeys to losing weight and living a healthier life. We are able to support each other as well as keep tabs on each other, but we came up with the idea to get other colleagues involved. The idea behind it is that if we surround ourselves with like-minded people who are trying to achieve similar goals, the harder we will work and the more likely we will accomplish something.

I decided that June 1, 2013 to September 1, 2013 is a good time frame for this challenge (13 weeks). Once a week will be the weigh-in day and the person who lost the most percentage of weight wins a prize of sorts.

My first question is: if your place of work were to hold a contest similar to this, would you participate? How likely will you follow-through to the very end?

Next, I plan on creating a newsletter of sorts to hand out on weigh-in day every week. I want to include different topics about getting healthy and losing weight. I am trying to create a list of topics to include and so far I have:

- Getting started
- Setting goals and tracking progress
- Adding cardio/weight training
- Nutrition and meal planning
- Cooking at home/bringing lunch vs eating out
- Recipes
- What to do when reaching a plateau
- Overcoming emotional eating
- Adding fruits and veggies (or weekly challenges like, eat 5 different colors of fruits/veggies everyday for a week)
- Workout playlists/music that pumps you up
- Weight loss vs Fat loss
- Tracking your steps with a pedometer
- Eat this not that
- Long term maintenance
- Couch to 5k

For each of the topics, I would include articles found online and whatnot. Obviously, neither I nor my coworker are experts by any means, but I feel like with a little bit of research, we can get started on the right foot and we can help create healthier habits (like bringing a bag of apples for everyone instead of a box of donuts haha).

I mainly got this idea of weekly handouts from my time doing Weight Watchers a few years ago. Every week, they handed out a new newsletter with all sorts of useful information and little tidbits of inspiration to keep you motivated.

Do any of you know of any good websites we can use for articles? And as far as topics goes, got any suggestions for interesting/inspiring/fresh ideas? What can I do, as facilitator of this challenge, to motivate everyone and keep things fair?

Any help is appreciated! If this is a terrible idea, please let me know what you think! If this idea is awesome, let me know too! Keep in mind that I would LOVE my coworkers to hop on this website and track that way (it would make things sooooo much easier), but some of them are not very tech savvy, so that isn't an option. We will have to track the good ole fashioned way.

Thanks for reading