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This site looks good for the fitness buffs. I haven’t tried it out yet, still shopping around.

Here is an excerpt from the site:

SparkPeople Inc. is a leading online preventive health company. Our goal is to help as many people as possible reach their goals and lead meaningful lives. All of our programs and services are medically sound, completely free of charge, community-based and accessible. In the areas of health, fitness, goal-setting and leadership, we help people discover what will truly motivate them to reach their goals.

Our vision, our team and our company culture are a unique combination in the weight loss and fitness world. The company has attracted leading talent from some of the best companies in the world. We’ve also been able to partner with many top experts in the industry. The great results we see as a company are a direct result of each team member achieving great fitness and leadership results as individuals. Also, as a privately funded company we can focus on meeting the goals of our members instead of the goals of Wall Street.

After nearly five years of helping people reach their full potential, SparkPeople is one of the fastest growing online brands in weight loss and healthy living.

Here are a few other similar fitness sites.

Gimme20 - Fitness Tracking & Fitness Community

Find a workout: There are plenty of already built workouts for you to choose from. Browse and find a workout that meets your fancy, and then click ‘Track this Workout’ to begin tracking your fitness results.

Build a workout: The workout builder allows you to build your own workout. Once you finished building a workout — Gimme20.com will automagically track it for you.
In addition, you may choose to share the workout with the rest of the community, or to keep it private.
So, browse for exercises and add them to workouts. It’s that simple.

Traineo - Fitness & Weight Loss Community

Traineo’s idea is simple: join traineo for free and pick up to 4 friends or members of your family (who will become your ‘traineo motivators’) to receive weekly email updates on your progress towards your weight loss and fitness goals. Our easy-to-use software allows you to choose what you’d like traineo to report to your motivators so they can give you the motivation, support and accountability you need to achieve your goals.

Let us know of any more in the comments.