What is a free website to create a weight loss challenge for a group of people?

My sorority wants to do a weight loss challenge based on percentage on a free website. We like weightlosswars.com’s competitions, but they charge per person to do the challenge and a lot of our girls can’t do that. We need a free option that’s easy to use and easy to track. Thanks!

Chosen Answer:

try sparkpeople.com

you do not have to buy anything or to pay, it’s free. Register with
your details, and create your own customised diet plan, workout, food
diary, post on forums, join groups, find local groups in your area and
meet same-minded people in real life.
by: ny
on: 1st February 11