For weight loss I like to have clients do some documenting of challenges using smart phones.
Take a picture of every thing you eat challenge, this gets them looking at what they are eating more critically. And if you are posting these pics somewhere, it really makes them think twice about what they are consuming.
Take a picture of how far you park from the entrance of stores and work challenge. This one gets them walking more throughout the day, but remind them to consider safety if they are leaving stores and work alone and/or late at night.
Take a picture of your weight on a scale (standing on a scale, picture of their feet and read out) three times a day challenge. While I don’t like to do a lot of weigh ins, this challenge keeps their minds on their weight loss goal. I recommend that they try to get on the scale right before each meal. I have also consider having them get on again immediately after each meal, but so far it hasn’t been necessary for getting results.
You can put your own ideas into those frameworks and challenge goals, minimums, awards, etc.