You can add whatever additional measurements you'd like to track. On the measurements page, click the button that says "Add/Change what you measure" and you'll be able to add it there.
Hope that helps,
"You may have a fresh start any moment you choose, for this thing that we call "failure" is not the falling down but the staying down." Mary Pickford
"No matter how slow you go, you are still lapping everybody on the couch."