Just a MFP n00b striving to set a (challenging yet realistic

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Hi, I am new to the MFP community and I wanted to introduce myself.

I have been struggling with weight gain for the last couple years, and since a severe injury over a year ago, I have manage to make a lot of excuses to put off getting healthy. When I was a more active person, my personal image of my health and fitness was tied to my abilities rather than a number on the scale. As liberating as this detachment from the scale was at the time, it now makes defining a goal weight difficult.

So my question for you veteran MFP members is this: How did you determine your goal weight? Are you striving for the "best shape of my life" or "as fit as I was as a 20 year old"?