Is What You Really Want A Need?

It's taken me a while to figure this out, and I've heard it before. It really struck me the other day. Are the things you go after and really want needs for you? Here's the difference. Being in shape for me is a need. It's something I have desired my whole life, but I turned into a need a long time ago. I cannot function without doing it. So are your goals wants or needs? Can you not function in a day if you don't make any movement towards them?