My goal is to lose about 100 pounds throughout the process, which means that I will need to hit the top of the allowed percentages on each weigh in. I suppose we can also do a clothing size challenge. For instance, I am trying to fit into the next size down before the end of the week. We could also do a calorie burn challenge. I push for 3,500 calories a day or more, though I do not always get that. I would not recommend focusing on calories in, as it could push someone to undereat, or regulate their eating too much, which could cause a slower weight loss. Fluctuating the calories actually helps. Perhaps a challenge to give up an unhealthy food, however. For instance, I have not had any sugary or fake sugary drinks since May of this year.

I'm doing a 30 day plank challenge currently. It would be a good one for the group since plank can be done at variable degrees of difficulty depending on the angle you choose.

What about giving up one thing you really like to eat that may not be so healthy for you? I drink coffee every day and could try a week without it. I gave up diet soda a few months ago and never went back. I know I have a tendency to save calories for a little something sweet so I can certainly give that up.