New More Awesome Goal Thoughts

It’s been a few months since I created my first 2 More Awesome goals.  And I have thoughts on the third goal.  It should be something related to fitness.  But how to make it a SMART goal?  That’s something I need think about more.  Inches?  Pounds?  Number of repetitions?  Workout a number of times?  Those would all achieve the measurable result, I just need to figure out which is the best for me.  Any ideas out there?