Hi, welcome to sparkpeople and to our group. The website has so much to offer - I suggest getting into it gradually so you don't overwhelm yourself or burn out.
You've got some tough (but good) questions! I don't claim to have 100% right answers, but here's what I think.
Measuring - I'm not really sure. I measure my wait/hips/neck/thigh and just recently got a body fat test done. Except for the body fat, I don't really know what's "ideal". For the body fat, there are several charts online plus one they gave me with indications of what I should aim for given my goals (which are to be "athletic" as opposed to "average").
Running - All the runners I know have nice legs, so I'm not sure about running making anything worse. Running is a great cardio workout - I think it's one of the more efficient ways to burn calories, especially if you push yourself every now and then. If you run on a treadmill, don't always do the same thing, and don't keep the pace the same the whole workout. If you go outside, don't always take the same route... Your body will get used to whatever you do on a regular basis and your heart rate won't go up as high and you won't burn as many calories. Give yourself something knew - a little faster, more or even just a different pattern of hills, etc. -- that will get your heart rate back up.
Vitamin supplements - I take a one-a-day vitamin pill for women. I also try to watch things every once in a while, because the best source of these things is from your food.
There tons of SparkPeople articles on all of these topics if you go to the resources section, you can find out more information (and, for example, which foods are good sources of which vitamins).
Welcome once again, I hope you enjoy the site as much as I have!!
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