My mom and sister say they will join Weight Watchers or a gym with me after the new year. We haven't decided exactly which we want to do. Maybe we'll even do both.
I got them a couple presents for Christmas to remind them. I bought them each a cute tape measure and a bathroom scale. I also bought them each a calorie count book and a notebook to keep track of things.
I don't think I would dare buy anyone else gifts like these. They might be insulted.