They say that if your goals are specific, attainable but challenging, and written down, then you'll be more likely to achieve them. I'm not sure why the written part matters...maybe it's to keep you reminded of the goal and/or make it tangible. Anyway, here are some of my physical goals for 2008:
Be able to:
Swim 2.4 miles nonstop (preferably not in a pool!)
Bike 112 miles nonstop
Run 26.2 miles nonstop (preferably at a race)
Get flexible again...enough to touch my head to my knees when I "hang it down" and both my knees and head to the ground while doing the quad stretch.
I think these goals meet the above criteria. Let's see if it happens.