So, the widest part doesn't necessarily have to be at the hips? Sometimes, like w/large or wide thighs you measure there, right under the buttocks? And that would still be your "hip" measurment??
I would say yes. If you're sewing a pair of pants, this is the widest part at the side seam, to acommodate a "generous" rear end or thighs.
If you're asking for the purpose of having a base measure to see how much you've gained or lost (which is probably more likely since this is an Exercise Board
) then the widest part is an indication of where you tend to put on fat the easiest, and it's also an indication of where you'll see the fastest change when you start losing that fat. I'm no exercise expert, but that's what I would do.
Some people also measure around the largest part of the thigh (around a single thigh, not around the hips), to see how much that changes with diet and exercise also.
Of course it also just occured to me that there are already-fit people who are interested in how much their hip (or thigh or arm, etc) measurement changes when they're trying to bulk up
by doing hard training. Ahem. These people also need to establish a starting point from which to measure.
I think the main thing here is to establish where the base measurments are for your
body (around your rear end or around your hips) and always use that as your comparison position.