I have thought about it quite a bit in the past, but not so much in recent years.

Mine was originally based on the usual BMI categories and my personal history. I'm 5'9", and I have been as low as 155 lbs in my adult life (mid-20s). I am in fact somewhat big-boned, and when I was that weight a number of people thought I was kind of skinny. Gained about 30 lbs over 10 years, then got myself back down to the "upper end of normal" BMI target of 165 when I was in my late 30s. I liked how I felt at this weight and I maintained it for several years without too much effort, so it seems like a workable target. I then spent 25 years with much less physical activity and meandered between 180 and 200. This was the period in which I joined WW and for a while used the 165 target weight.

Now that I am older, even getting below 190 has become difficult -- I feel stressful emotions at lower weights. (However I am adamant that I will accomplish this to improve my health.) I use 175 as my target, because I think those last 10 lbs to the old ideal weight are going to be too problematic. I'd rather concentrate on increasing fitness than losing weight past that.

175 lbs. I weighed 179 this morning. Highest acceptable WW weight was 184 lbs so that has always been my official goal. But in the 16 years I’ve been at goal I’ve been up to 186 lbs and down to 168 lbs. I think mid 170s is best for me now.

My official WW goal is simply the weight that gets me to "normal" on the BMI scale.

My personal target was developed in a more complicated manner. When I first joined WW, I got all the way down to my early high-school weight. That was definitely "skinny," and I enjoyed being able to wear smaller clothes, etc. Over time, though, that was really a lot of work to maintain, and when I started lifting weights, I realized that a few pounds of muscle were valuable. I found a weight where I felt good about myself (looks, clothes, health), but was not crazy to maintain and let me maintain some muscle as well. Unfortunately, that's 10-15 pounds lower than I've maintained over the past few years. Maybe it's my "older" metabolism, or whatever, but I haven't been able to get back down to that target weight very often. Nevertheless, I keep it in mind, because I worry that if I give up on it, and accept my current weight as my target, then there's no push to limit myself, and I'd let myself drift upwards. As such, I'm operating on the idea that some dynamic-tension is good to keep my weight in-check. It may be dumb, but that's how I seem to operate right now.

Below 200. I've realized that is the best I probably will ever do, and it is plenty healthy for my body frame. Yes, I'd like to weigh less than that, but I'm being realistic.