A point said: Crossfit is helping me to set goal for strength and healthy body versus old goals to be "stick skinny" even of the scale doesn't move or my pants don't get smaller my body will be toned and beautiful :)
Don't stop until you're satisfied. Forget the traditional markers of an ending. Forget the word count, and the manuscript length, and the genre expectations. Write until you're satisfied. And then edit until you're proud.
If you're just starting your journey to health and fitness, the first thing to do is just move! The rest will fall into place because you will learn what works for your body. Everyone is different and there are no quick fixes!