It is quite possible that I mixed in too much flour. It was my first time making a yeast dough so every time I kept kneading and it seemed to get sticky and wet again, I thought that meant I needed to add more flour. My arms were indeed very tired at the end of making this.

Still...the recipe I've been using lately has 3 cups water and 6.5 cups of flour and that leaves me with a very wet dough. I think I could easily add more flour to that if I wanted to.