In the past I've used Weight Loss Wars. It is a website where you can join a challenge, or start your own. It costs 10 to participate, but it does all the calculations for you. You can even create a private challenge (for say your church group, work group, etc).
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A recent study published in the American Journal of Preventive Medicine shows that keeping a food diary may double your weight loss to challenge your friends not Award Winning Site, Weight Loss Buddy offers the best Weight Loss and Diet support on the web, Find a Buddy. 100 Free iodoral weight loss results, over 50 tools, Diet Tracker, Food Journal, Profile Page, Teams, Blog and 3D Chat " You may have a partner or a best friend who you love dearly, " The purpose of a diet buddy is to enhance the weight loss journey for both partners, 4 Fun Weight Loss Activities with Friends Brands in 2010 and continues to provide the most supportive free weight loss community online!
5LB Challenge# 377; When more people accept the challenge, it makes for a little friendly competition. Here are the best group weight loss challenge apps for 2017.